diff --git a/config/alfresco/templates/webscripts/org/alfresco/repository/action/running-action.delete.desc.xml b/config/alfresco/templates/webscripts/org/alfresco/repository/action/running-action.delete.desc.xml
new file mode 100644
index 0000000000..93d3be358d
--- /dev/null
+++ b/config/alfresco/templates/webscripts/org/alfresco/repository/action/running-action.delete.desc.xml
@@ -0,0 +1,8 @@
+<webscript>
+  <shortname>Cancel a Running Action</shortname>
+  <description>Requests the cancellation of a currently running action.</description>
+  <url>/api/running-action/{action_tracking_id}</url>
+  <format default="json"/>
+  <authentication>admin</authentication>
+  <transaction>required</transaction>
+</webscript>
diff --git a/config/alfresco/web-scripts-application-context.xml b/config/alfresco/web-scripts-application-context.xml
index feb3a3b18a..4e6f921c56 100644
--- a/config/alfresco/web-scripts-application-context.xml
+++ b/config/alfresco/web-scripts-application-context.xml
@@ -913,6 +913,12 @@
           parent="abstractActionWebScript">
     </bean>
 
+    <!-- Cancels a running action -->
+    <bean id="webscript.org.alfresco.repository.action.running-action.delete"
+          class="org.alfresco.repo.web.scripts.action.RunningActionDelete"
+          parent="abstractActionWebScript">
+    </bean>
+
     <!-- Lists the running actions -->
     <bean id="webscript.org.alfresco.repository.action.running-actions.get"
           class="org.alfresco.repo.web.scripts.action.RunningActionsGet"
diff --git a/source/java/org/alfresco/repo/web/scripts/action/RunningActionDelete.java b/source/java/org/alfresco/repo/web/scripts/action/RunningActionDelete.java
new file mode 100644
index 0000000000..fb67258519
--- /dev/null
+++ b/source/java/org/alfresco/repo/web/scripts/action/RunningActionDelete.java
@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2005-2010 Alfresco Software Limited.
+ *
+ * This file is part of Alfresco
+ *
+ * Alfresco is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Alfresco 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with Alfresco. If not, see <http://www.gnu.org/licenses/>.
+ */
+package org.alfresco.repo.web.scripts.action;
+
+import java.util.Map;
+
+import org.alfresco.service.cmr.action.ExecutionDetails;
+import org.alfresco.service.cmr.action.ExecutionSummary;
+import org.springframework.extensions.webscripts.Cache;
+import org.springframework.extensions.webscripts.Status;
+import org.springframework.extensions.webscripts.WebScriptException;
+import org.springframework.extensions.webscripts.WebScriptRequest;
+
+/**
+ * @author Nick Burch
+ * @since 3.4
+ */
+public class RunningActionDelete extends AbstractActionWebscript
+{
+   @Override
+   protected Map<String, Object> buildModel(
+         RunningActionModelBuilder modelBuilder, WebScriptRequest req,
+         Status status, Cache cache) {
+      // Which action did they ask for?
+      String actionTrackingId = 
+         req.getServiceMatch().getTemplateVars().get("action_tracking_id");
+
+      // Check it exists
+      ExecutionSummary action = 
+         getSummaryFromKey(actionTrackingId);
+      if(action == null) {
+         throw new WebScriptException(
+               Status.STATUS_NOT_FOUND, 
+               "No Running Action found with that tracking id"
+         );
+      }
+      
+      ExecutionDetails details =
+         actionTrackingService.getExecutionDetails(action);
+      if(details == null) {
+         throw new WebScriptException(
+               Status.STATUS_NOT_FOUND, 
+               "No Running Action found with that tracking id"
+         );
+      }
+      
+      // Request the cancel
+      actionTrackingService.requestActionCancellation(action);
+      
+      // Report it cancelled
+      throw new WebScriptException(
+            Status.STATUS_GONE,
+            "Action cancellation requested"
+      );
+   }
+}
\ No newline at end of file
diff --git a/source/java/org/alfresco/repo/web/scripts/action/RunningActionRestApiTest.java b/source/java/org/alfresco/repo/web/scripts/action/RunningActionRestApiTest.java
index 510dd279db..c5381531ed 100644
--- a/source/java/org/alfresco/repo/web/scripts/action/RunningActionRestApiTest.java
+++ b/source/java/org/alfresco/repo/web/scripts/action/RunningActionRestApiTest.java
@@ -473,6 +473,54 @@ public class RunningActionRestApiTest extends BaseWebScriptTest
         assertEquals("/" + URL_RUNNING_ACTION + key1, jsonRD.get("details"));
     }
     
+    public void testRunningActionCancel() throws Exception 
+    {
+       Response response;
+       
+       
+       // Not allowed if you're not an admin
+       AuthenticationUtil.setFullyAuthenticatedUser(AuthenticationUtil.getGuestUserName());
+       response = sendRequest(new DeleteRequest(URL_RUNNING_ACTION + "MadeUp"), Status.STATUS_UNAUTHORIZED);
+       assertEquals(Status.STATUS_UNAUTHORIZED, response.getStatus());
+       
+       AuthenticationUtil.setFullyAuthenticatedUser(USER_NORMAL);
+       response = sendRequest(new DeleteRequest(URL_RUNNING_ACTION + "MadeUp"), Status.STATUS_UNAUTHORIZED);
+       assertEquals(Status.STATUS_UNAUTHORIZED, response.getStatus());
+       
+      
+       // If not found, you get a 404
+       AuthenticationUtil.setFullyAuthenticatedUser(AuthenticationUtil.getAdminUserName());
+       response = sendRequest(new DeleteRequest(URL_RUNNING_ACTION + "MadeUp"), Status.STATUS_NOT_FOUND);
+       assertEquals(Status.STATUS_NOT_FOUND, response.getStatus());
+
+       
+       // Create one
+       ReplicationDefinition rd = replicationService.createReplicationDefinition("Test1", "Testing");
+       replicationService.saveReplicationDefinition(rd);
+       actionTrackingService.recordActionExecuting(rd);
+       String id = rd.getId();
+       String instance = Integer.toString( ((ActionImpl)rd).getExecutionInstance() );
+       String key = "replicationActionExecutor=" + id + "=" + instance;
+       
+       assertEquals(false, actionTrackingService.isCancellationRequested(rd));
+
+       
+       // Request it to cancel
+       response = sendRequest(new DeleteRequest(URL_RUNNING_ACTION + key), Status.STATUS_GONE);
+       assertEquals(Status.STATUS_GONE, response.getStatus());
+       
+       
+       // Check it was cancelled
+       assertEquals(true, actionTrackingService.isCancellationRequested(rd));
+       
+       
+       // Request again - no change
+       response = sendRequest(new DeleteRequest(URL_RUNNING_ACTION + key), Status.STATUS_GONE);
+       assertEquals(Status.STATUS_GONE, response.getStatus());
+       
+       assertEquals(true, actionTrackingService.isCancellationRequested(rd));
+    }
+    
     
     @Override
     protected void setUp() throws Exception