diff --git a/lang/en/tag.php b/lang/en/tag.php
index d2ec5fa9d41..c3e65678db7 100644
--- a/lang/en/tag.php
+++ b/lang/en/tag.php
@@ -38,6 +38,7 @@ $string['errordeleting'] = 'Error deleting tag with id {$a}, please report to yo
 $string['errortagfrontpage'] = 'Tagging the site main page is not allowed';
 $string['errorupdatingrecord'] = 'Error updating tag record';
 $string['eventitemtagged'] = 'Item tagged';
+$string['eventtagflagged'] = 'Tag flagged';
 $string['eventtagupdated'] = 'Tag updated';
 $string['flag'] = 'Flag';
 $string['flagasinappropriate'] = 'Flag as inappropriate';
diff --git a/lib/classes/event/tag_flagged.php b/lib/classes/event/tag_flagged.php
new file mode 100644
index 00000000000..18adc67e26a
--- /dev/null
+++ b/lib/classes/event/tag_flagged.php
@@ -0,0 +1,91 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * Tag flagged event.
+ *
+ * @property-read array $other {
+ *      Extra information about event.
+ *
+ *      - string name: the name of the tag.
+ *      - string rawname: the raw name of the tag.
+ * }
+ *
+ * @package    core
+ * @copyright  2014 Mark Nelson <markn@moodle.com>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+namespace core\event;
+
+defined('MOODLE_INTERNAL') || die();
+
+class tag_flagged extends base {
+
+    /**
+     * Initialise the event data.
+     */
+    protected function init() {
+        $this->data['objecttable'] = 'tag';
+        $this->data['crud'] = 'u';
+        $this->data['edulevel'] = self::LEVEL_OTHER;
+    }
+
+    /**
+     * Returns localised general event name.
+     *
+     * @return string
+     */
+    public static function get_name() {
+        return get_string('eventtagflagged', 'tag');
+    }
+
+    /**
+     * Returns non-localised description of what happened.
+     *
+     * @return string
+     */
+    public function get_description() {
+        return 'The tag with the id ' . $this->objectid . ' was flagged by the user with the id ' . $this->userid;
+    }
+
+    /**
+     * Return legacy data for add_to_log().
+     *
+     * @return array
+     */
+    protected function get_legacy_logdata() {
+        return array(SITEID, 'tag', 'flag', 'index.php?id='. $this->objectid, $this->objectid, '', $this->userid);
+    }
+
+    /**
+     * Custom validation.
+     *
+     * @throws \coding_exception
+     * @return void
+     */
+    protected function validate_data() {
+        parent::validate_data();
+
+        if (!isset($this->other['name'])) {
+            throw new \coding_exception('The name must be set in $other.');
+        }
+
+        if (!isset($this->other['rawname'])) {
+            throw new \coding_exception('The rawname must be set in $other.');
+        }
+    }
+}
diff --git a/tag/lib.php b/tag/lib.php
index b9d8660c897..5e467e52c03 100644
--- a/tag/lib.php
+++ b/tag/lib.php
@@ -1260,21 +1260,43 @@ function tag_record_tagged_with($record_type, $record_id, $tag) {
 }
 
 /**
- * Flag a tag as inapropriate
+ * Flag a tag as inappropriate.
  *
- * @package core_tag
- * @access  private
- * @param   int|array $tagids a single tagid, or an array of tagids
+ * @param int|array $tagids a single tagid, or an array of tagids
  */
 function tag_set_flag($tagids) {
     global $DB;
 
-    $tagids = (array)$tagids;
-    foreach ($tagids as $tagid) {
-        $tag = $DB->get_record('tag', array('id'=>$tagid), 'id, flag');
-        $tag->flag++;
-        $tag->timemodified = time();
-        $DB->update_record('tag', $tag);
+    $tagids = (array) $tagids;
+
+    // Use the tagids to create a select statement to be used later.
+    list($tagsql, $tagparams) = $DB->get_in_or_equal($tagids, SQL_PARAMS_NAMED);
+
+    // Update all the tags to flagged.
+    $sql = "UPDATE {tag}
+               SET flag = flag + 1, timemodified = :time
+             WHERE id $tagsql";
+
+    // Update all the tags.
+    $DB->execute($sql, array_merge(array('time' => time()), $tagparams));
+
+    // Get all the tags.
+    if ($tags = $DB->get_records_select('tag', 'id '. $tagsql, $tagparams, 'id ASC')) {
+        // Loop through and fire an event for each tag that it was flagged.
+        foreach ($tags as $tag) {
+            $event = \core\event\tag_flagged::create(array(
+                'objectid' => $tag->id,
+                'relateduserid' => $tag->userid,
+                'context' => context_system::instance(),
+                'other' => array(
+                    'name' => $tag->name,
+                    'rawname' => $tag->rawname
+                )
+
+            ));
+            $event->add_record_snapshot('tag', $tag);
+            $event->trigger();
+        }
     }
 }
 
diff --git a/tag/tests/events_test.php b/tag/tests/events_test.php
index 2f0902c73e7..29d16452356 100644
--- a/tag/tests/events_test.php
+++ b/tag/tests/events_test.php
@@ -136,4 +136,60 @@ class core_tag_events_testcase extends advanced_testcase {
         $expected = null;
         $this->assertEventLegacyLogData($expected, $event);
     }
+
+    /**
+     * Test the tag flagged event.
+     */
+    public function test_tag_flagged() {
+        global $DB;
+
+        $this->setAdminUser();
+
+        // Create tags we are going to flag.
+        $tag = $this->getDataGenerator()->create_tag();
+        $tag2 = $this->getDataGenerator()->create_tag();
+
+        // Trigger and capture the event for setting the flag of a tag.
+        $sink = $this->redirectEvents();
+        tag_set_flag($tag->id);
+        $events = $sink->get_events();
+        $event = reset($events);
+
+        // Check that the flag was updated.
+        $tag = $DB->get_record('tag', array('id' => $tag->id));
+        $this->assertEquals(1, $tag->flag);
+
+        // Check that the event data is valid.
+        $this->assertInstanceOf('\core\event\tag_flagged', $event);
+        $this->assertEquals(context_system::instance(), $event->get_context());
+        $expected = array(SITEID, 'tag', 'flag', 'index.php?id=' . $tag->id, $tag->id, '', '2');
+        $this->assertEventLegacyLogData($expected, $event);
+
+        // Unset the flag for both (though by default tag2 should have been created with 0 already).
+        tag_unset_flag(array($tag->id, $tag2->id));
+
+        // Trigger and capture the event for setting the flag for multiple tags.
+        $sink = $this->redirectEvents();
+        tag_set_flag(array($tag->id, $tag2->id));
+        $events = $sink->get_events();
+
+        // Check that the flags were updated.
+        $tag = $DB->get_record('tag', array('id' => $tag->id));
+        $this->assertEquals(1, $tag->flag);
+        $tag2 = $DB->get_record('tag', array('id' => $tag2->id));
+        $this->assertEquals(1, $tag2->flag);
+
+        // Confirm the events.
+        $event = $events[0];
+        $this->assertInstanceOf('\core\event\tag_flagged', $event);
+        $this->assertEquals(context_system::instance(), $event->get_context());
+        $expected = array(SITEID, 'tag', 'flag', 'index.php?id=' . $tag->id, $tag->id, '', '2');
+        $this->assertEventLegacyLogData($expected, $event);
+
+        $event = $events[1];
+        $this->assertInstanceOf('\core\event\tag_flagged', $event);
+        $this->assertEquals(context_system::instance(), $event->get_context());
+        $expected = array(SITEID, 'tag', 'flag', 'index.php?id=' . $tag2->id, $tag2->id, '', '2');
+        $this->assertEventLegacyLogData($expected, $event);
+    }
 }
diff --git a/tag/user.php b/tag/user.php
index f6840f701f9..983fdb95a20 100644
--- a/tag/user.php
+++ b/tag/user.php
@@ -47,8 +47,6 @@ switch ($action) {
     case 'flaginappropriate':
 
         $tagid = tag_get_id($tag);
-        // Add flaging action to logs
-        add_to_log(SITEID, 'tag', 'flag', 'index.php?id='. $tagid, $tagid, '', $USER->id);
 
         tag_set_flag($tagid);