diff --git a/phpBB/adm/style/acp_main.html b/phpBB/adm/style/acp_main.html
index 4b6bc1910d..3318215623 100644
--- a/phpBB/adm/style/acp_main.html
+++ b/phpBB/adm/style/acp_main.html
@@ -143,6 +143,12 @@
 					<dd><input type="hidden" name="action" value="purge_cache" /><input class="button2" type="submit" id="action_purge_cache" name="action_purge_cache" value="{L_RUN}" /></dd>
 				</dl>
 			</form>
+			<form id="action_purge_cache_form" method="post" action="{U_ACTION}">
+				<dl>
+					<dt><label for="action_purge_cache">{L_PURGE_SESSIONS}</label><br /><span>{L_PURGE_SESSIONS_EXPLAIN}</span></dt>
+					<dd><input type="hidden" name="action" value="purge_sessions" /><input class="button2" type="submit" id="action_purge_sessions" name="action_purge_sessions" value="{L_RUN}" /></dd>
+				</dl>
+			</form>
 			<!-- ENDIF -->
   		</fieldset>
 	<!-- ENDIF -->
diff --git a/phpBB/includes/acp/acp_main.php b/phpBB/includes/acp/acp_main.php
index 5d6bd40681..42f6aa0b8e 100644
--- a/phpBB/includes/acp/acp_main.php
+++ b/phpBB/includes/acp/acp_main.php
@@ -97,6 +97,10 @@ class acp_main
 						$confirm = true;
 						$confirm_lang = 'PURGE_CACHE_CONFIRM';
 					break;
+					case 'purge_sessions':
+						$confirm = true;
+						$confirm_lang = 'PURGE_SESSIONS_CONFIRM';
+					break;
 
 					default:
 						$confirm = true;
@@ -341,6 +345,44 @@ class acp_main
 
 						add_log('admin', 'LOG_PURGE_CACHE');
 					break;
+					
+					case 'purge_sessions':
+						if ((int) $user->data['user_type'] !== USER_FOUNDER)
+						{
+							trigger_error($user->lang['NO_AUTH_OPERATION'] . adm_back_link($this->u_action), E_USER_WARNING);
+						}
+						
+						$tables = array(CONFIRM_TABLE, SESSIONS_TABLE);
+						
+						// DELETE would probably take a lot longer if we're dealing with a runaway table
+						foreach ($tables as $table)
+						{
+							$sql = "TRUNCATE TABLE $table";
+							$db->sql_query($sql);
+						}
+						
+						// let's restore the admin session
+						$reinsert_ary = array(
+								'session_id'			=> (string) $user->session_id,
+								'session_page'			=> (string) substr($user->page['page'], 0, 199),
+								'session_forum_id'		=> $user->page['forum'],
+								'session_user_id'		=> (int) $user->data['user_id'],
+								'session_start'			=> (int) $user->data['session_start'],
+								'session_last_visit'	=> (int) $user->data['session_last_visit'],
+								'session_time'			=> (int) $user->time_now,
+								'session_browser'		=> (string) trim(substr($user->browser, 0, 149)),
+								'session_forwarded_for'	=> (string) $user->forwarded_for,
+								'session_ip'			=> (string) $user->ip,
+								'session_autologin'		=> (int) $user->data['session_autologin'],
+								'session_admin'			=> 1,
+								'session_viewonline'	=> (int) $user->data['session_viewonline'],
+						);
+						
+						$sql = 'INSERT INTO ' . SESSIONS_TABLE . ' ' . $db->sql_build_array('INSERT', $reinsert_ary);
+						$db->sql_query($sql);
+						
+						add_log('admin', 'LOG_PURGE_SESSIONS');
+					break;
 				}
 			}
 		}
diff --git a/phpBB/language/en/acp/common.php b/phpBB/language/en/acp/common.php
index 55c3ed0cac..efcf88e09a 100644
--- a/phpBB/language/en/acp/common.php
+++ b/phpBB/language/en/acp/common.php
@@ -136,6 +136,7 @@ $lang = array_merge($lang, array(
 	'ACP_PERMISSION_TRACE'		=> 'Permission trace',
 	'ACP_PHP_INFO'				=> 'PHP information',
 	'ACP_POST_SETTINGS'			=> 'Post settings',
+	'ACP_PRUNE_ATTACHMENTS'		=> 'Prune attachments',
 	'ACP_PRUNE_FORUMS'			=> 'Prune forums',
 	'ACP_PRUNE_USERS'			=> 'Prune users',
 	'ACP_PRUNING'				=> 'Pruning',
@@ -339,6 +340,10 @@ $lang = array_merge($lang, array(
 	'PURGE_CACHE_CONFIRM'	=> 'Are you sure you wish to purge the cache?',
 	'PURGE_CACHE_EXPLAIN'	=> 'Purge all cache related items, this includes any cached template files or queries.',
 
+	'PURGE_SESSIONS'			=> 'Purge all sessions',
+	'PURGE_SESSIONS_CONFIRM'	=> 'Are you sure you wish to purge all sessions? This will log out all users.',
+	'PURGE_SESSIONS_EXPLAIN'	=> 'Purge all sessions. This will log out all users by truncating the session table.',
+
 	'RESET_DATE'					=> 'Reset board’s start date',
 	'RESET_DATE_CONFIRM'			=> 'Are you sure you wish to reset the board’s start date?',
 	'RESET_ONLINE'					=> 'Reset most users ever online',
@@ -611,6 +616,7 @@ $lang = array_merge($lang, array(
 	'LOG_PROFILE_FIELD_REMOVED'		=> '<strong>Profile field removed</strong><br />» %s',
 
 	'LOG_PRUNE'					=> '<strong>Pruned forums</strong><br />» %s',
+	'LOG_PRUNE_ATTACHMENTS'		=> '<strong>Pruned attachments</strong>',
 	'LOG_AUTO_PRUNE'			=> '<strong>Auto-pruned forums</strong><br />» %s',
 	'LOG_PRUNE_USER_DEAC'		=> '<strong>Users deactivated</strong><br />» %s',
 	'LOG_PRUNE_USER_DEL_DEL'	=> '<strong>Users pruned and posts deleted</strong><br />» %s',