diff --git a/app/Controller/EventsController.php b/app/Controller/EventsController.php
index fb7377b02..73a7d6a56 100644
--- a/app/Controller/EventsController.php
+++ b/app/Controller/EventsController.php
@@ -26,7 +26,7 @@ class EventsController extends AppController
     );
 
     private $acceptedFilteringNamedParams = array('sort', 'direction', 'focus', 'extended', 'overrideLimit', 'filterColumnsOverwrite', 'attributeFilter', 'extended', 'page',
-        'searchFor', 'attributeFilter', 'proposal', 'correlation', 'warning', 'deleted', 'includeRelatedTags', 'distribution', 'taggedAttributes', 'galaxyAttachedAttributes', 'objectType', 'attributeType', 'focus', 'extended', 'overrideLimit', 'filterColumnsOverwrite', 'feed', 'server', 'toIDS'
+        'searchFor', 'attributeFilter', 'proposal', 'correlation', 'warning', 'deleted', 'includeRelatedTags', 'distribution', 'taggedAttributes', 'galaxyAttachedAttributes', 'objectType', 'attributeType', 'focus', 'extended', 'overrideLimit', 'filterColumnsOverwrite', 'feed', 'server', 'toIDS', 'sighting'
     );
 
     public $defaultFilteringRules =  array(
@@ -41,6 +41,7 @@ class EventsController extends AppController
         'feed' => 0,
         'server' => 0,
         'distribution' => array(0, 1, 2, 3, 4, 5),
+        'sighting' => 0,
         'taggedAttributes' => '',
         'galaxyAttachedAttributes' => ''
     );
@@ -1121,7 +1122,9 @@ class EventsController extends AppController
             $filters['sort'] = 'timestamp';
             $filters['direction'] = 'desc';
         }
-        $params = $this->Event->rearrangeEventForView($event, $filters, $all);
+        $sightingsData = $this->Event->getSightingData($event);
+        $this->set('sightingsData', $sightingsData);
+        $params = $this->Event->rearrangeEventForView($event, $filters, $all, $sightingsData);
         $this->params->params['paging'] = array($this->modelClass => $params);
         // workaround to get the event dates in to the attribute relations
         $relatedDates = array();
@@ -1152,8 +1155,6 @@ class EventsController extends AppController
                 $this->set($variable, $currentModel->{$variable});
             }
         }
-        $sightingsData = $this->Event->getSightingData($event);
-        $this->set('sightingsData', $sightingsData);
         if (Configure::read('Plugin.Enrichment_services_enable')) {
             $this->loadModel('Module');
             $modules = $this->Module->getEnabledModules($this->Auth->user());
@@ -1367,7 +1368,9 @@ class EventsController extends AppController
             }
         }
         unset($modificationMap);
-        $params = $this->Event->rearrangeEventForView($event, $filters);
+        $sightingsData = $this->Event->getSightingData($event);
+        $this->set('sightingsData', $sightingsData);
+        $params = $this->Event->rearrangeEventForView($event, $filters, false, $sightingsData);
 
         $this->params->params['paging'] = array($this->modelClass => $params);
         $this->set('event', $event);
@@ -1410,8 +1413,6 @@ class EventsController extends AppController
                                                                                         'recursive' => -1,
                                                                                         'contain' => array('Org', 'RequesterOrg'))));
         }
-        $sightingsData = $this->Event->getSightingData($event);
-        $this->set('sightingsData', $sightingsData);
         if (Configure::read('Plugin.Enrichment_services_enable')) {
             $this->loadModel('Module');
             $modules = $this->Module->getEnabledModules($this->Auth->user());
diff --git a/app/Model/Event.php b/app/Model/Event.php
index b856812cb..73b8afd6b 100755
--- a/app/Model/Event.php
+++ b/app/Model/Event.php
@@ -4369,7 +4369,8 @@ class Event extends AppModel
         $correlatedShadowAttributes,
         $filterType = false,
         &$eventWarnings,
-        $warningLists
+        $warningLists,
+        $sightingsData
     ) {
         $attribute['objectType'] = 'attribute';
         $include = true;
@@ -4419,6 +4420,15 @@ class Event extends AppModel
                 $include = $include && ($filterType['server'] == 2);
             }
 
+            /* sightings */
+            if ($filterType['sighting'] == 0) { // `both`
+                // pass, do not consider as `both` is selected
+            } else if (isset($sightingsData['data'][$attribute['id']])) { // `include only`
+                $include = $include && ($filterType['sighting'] == 1);
+            } else { // `exclude`
+                $include = $include && ($filterType['sighting'] == 2);
+            }
+
             /* TypeGroupings */
             if (
                 $filterType['attributeFilter'] != 'all'
@@ -4531,7 +4541,8 @@ class Event extends AppModel
         $correlatedShadowAttributes,
         $filterType = false,
         &$eventWarnings,
-        $warningLists
+        $warningLists,
+        $sightingsData
     ) {
         $object['category'] = $object['meta-category'];
         $proposal['objectType'] = 'object';
@@ -4547,7 +4558,8 @@ class Event extends AppModel
                     $correlatedShadowAttributes,
                     false,
                     $eventWarnings,
-                    $warningLists
+                    $warningLists,
+                    $sightingsData
                 );
                 if ($result['include']) {
                     $temp[] = $result['data'];
@@ -4561,16 +4573,17 @@ class Event extends AppModel
             || $filterType['correlation'] != 0
             || $filterType['proposal'] != 0
             || $filterType['warning'] != 0
+            || $filterType['sighting'] != 0
             || $filterType['feed'] != 0
             || $filterType['server'] != 0
         ) {
-            $include = $this->__checkObjectByFilter($object, $filterType, $correlatedAttributes, $correlatedShadowAttributes);
+            $include = $this->__checkObjectByFilter($object, $filterType, $correlatedAttributes, $correlatedShadowAttributes, $sightingsData);
         }
 
         return array('include' => $include, 'data' => $object);
     }
 
-    private function __checkObjectByFilter($object, $filterType, $correlatedAttributes, $correlatedShadowAttributes)
+    private function __checkObjectByFilter($object, $filterType, $correlatedAttributes, $correlatedShadowAttributes, $sightingsData)
     {
         $include = true;
 
@@ -4654,6 +4667,35 @@ class Event extends AppModel
             }
         }
 
+        /* sighting */
+        if ($filterType['sighting'] == 0) { // `both`
+            // pass, do not consider as `both` is selected
+        } else if ($filterType['sighting'] == 1 || $filterType['sighting'] == 2) {
+            $flagKeep = false;
+            foreach ($object['Attribute'] as $k => $attribute) { // check if object contains at least 1 warning
+                if (isset($sightingsData['data'][$attribute['id']])) {
+                    $flagKeep = ($filterType['sighting'] == 1); // keep if server are included
+                } else {
+                    $flagKeep = ($filterType['sighting'] == 2); // keep if server are excluded
+                }
+                if (!$flagKeep && !empty($attribute['ShadowAttribute'])) {
+                    foreach ($attribute['ShadowAttribute'] as $shadowAttribute) {
+                        if (isset($sightingsData['data'][$attribute['id']])) {
+                            $flagKeep = ($filterType['sighting'] == 1); // do not keep if server are excluded
+                            break;
+                        }
+                    }
+                }
+                if ($flagKeep) {
+                    break;
+                }
+            }
+            if (!$flagKeep) {
+                $include = false;
+                return $include;
+            }
+        }
+
         /* feed */
         if ($filterType['feed'] == 0) { // `both`
             // pass, do not consider as `both` is selected
@@ -4747,7 +4789,7 @@ class Event extends AppModel
         return $object;
     }
 
-    public function rearrangeEventForView(&$event, $passedArgs = array(), $all = false)
+    public function rearrangeEventForView(&$event, $passedArgs = array(), $all = false, $sightingsData=array())
     {
         $this->Warninglist = ClassRegistry::init('Warninglist');
         $warningLists = $this->Warninglist->fetchForEventView();
@@ -4764,6 +4806,7 @@ class Event extends AppModel
             'warning' => isset($passedArgs['warning']) ? $passedArgs['warning'] : 0,
             'deleted' => isset($passedArgs['deleted']) ? $passedArgs['deleted'] : 0,
             'toIDS' => isset($passedArgs['toIDS']) ? $passedArgs['toIDS'] : 0,
+            'sighting' => isset($passedArgs['sighting']) ? $passedArgs['sighting'] : 0,
             'feed' => isset($passedArgs['feed']) ? $passedArgs['feed'] : 0,
             'server' => isset($passedArgs['server']) ? $passedArgs['server'] : 0
         );
@@ -4784,7 +4827,8 @@ class Event extends AppModel
                 $correlatedShadowAttributes,
                 $filterType,
                 $eventWarnings,
-                $warningLists
+                $warningLists,
+                $sightingsData
             );
             if ($result['include']) {
                 $event['objects'][] = $result['data'];
@@ -4812,7 +4856,8 @@ class Event extends AppModel
                     $correlatedShadowAttributes,
                     $filterType,
                     $eventWarnings,
-                    $warningLists
+                    $warningLists,
+                    $sightingsData
                 );
                 if ($result['include']) {
                     $event['objects'][] = $result['data'];
diff --git a/app/View/Elements/Events/View/eventFilteringQueryBuilder.ctp b/app/View/Elements/Events/View/eventFilteringQueryBuilder.ctp
index f693fdbd6..c20956e54 100644
--- a/app/View/Elements/Events/View/eventFilteringQueryBuilder.ctp
+++ b/app/View/Elements/Events/View/eventFilteringQueryBuilder.ctp
@@ -182,6 +182,21 @@ function triggerEventFilteringTool(clicked) {
                     5: "Inherit",
                 }
             },
+            {
+                "input": "radio",
+                "type": "integer",
+                "operators": [
+                    "equal",
+                ],
+                "unique": true,
+                "id": "sighting",
+                "label": "Sightings",
+                "values": {
+                    0: "Both",
+                    1: "Have sighting(s) only",
+                    2: "Doesn\'t have sighting(s)"
+                }
+            },
             <?php if (!empty($attributeTags)): ?>
             {
                 "input": "select",
@@ -305,6 +320,13 @@ function triggerEventFilteringTool(clicked) {
                     value: <?php echo isset($filters['server']) ? h($filters['server']) : 0; ?>
                 },
                 <?php endif; ?>
+                <?php if (count($advancedFilteringActiveRules) == 0 || isset($advancedFilteringActiveRules['sighting'])): ?>
+                {
+                    field: 'sighting',
+                    id: 'sighting',
+                    value: <?php echo isset($filters['sighting']) ? h($filters['sighting']) : 0; ?>
+                },
+                <?php endif; ?>
                 <?php if (count($advancedFilteringActiveRules) == 0 || isset($advancedFilteringActiveRules['distribution'])): ?>
                 {
                     field: 'distribution',