diff --git a/src/main/java/org/dynmap/DynmapPlugin.java b/src/main/java/org/dynmap/DynmapPlugin.java
index 2d651631..f76ccd41 100644
--- a/src/main/java/org/dynmap/DynmapPlugin.java
+++ b/src/main/java/org/dynmap/DynmapPlugin.java
@@ -181,7 +181,7 @@ public class DynmapPlugin extends JavaPlugin {
         
         permissions = NijikokunPermissions.create(getServer(), "dynmap");
         if (permissions == null)
-            permissions = new OpPermissions(new String[] { "fullrender", "reload" });
+            permissions = new OpPermissions(new String[] { "fullrender", "cancelrender", "radiusrender", "resetstats", "reload" });
 
         dataDirectory = this.getDataFolder();
         /* Load block models */
@@ -501,6 +501,7 @@ public class DynmapPlugin extends JavaPlugin {
         "hide",
         "show",
         "fullrender",
+        "cancelrender",
         "radiusrender",
         "reload",
         "stats",
@@ -585,6 +586,22 @@ public class DynmapPlugin extends JavaPlugin {
                 } else {
                     sender.sendMessage("World name is required");
                 }
+            } else if (c.equals("cancelrender") && checkPlayerPermission(sender,"cancelrender")) {
+                if (args.length > 1) {
+                    for (int i = 1; i < args.length; i++) {
+                        World w = getServer().getWorld(args[i]);
+                        if(w != null)
+                            mapManager.cancelRender(w,sender);
+                        else
+                            sender.sendMessage("World '" + args[i] + "' not defined/loaded");
+                    }
+                } else if (player != null) {
+                    Location loc = player.getLocation();
+                    if(loc != null)
+                        mapManager.cancelRender(loc.getWorld(), sender);
+                } else {
+                    sender.sendMessage("World name is required");
+                }
             } else if (c.equals("reload") && checkPlayerPermission(sender, "reload")) {
                 sender.sendMessage("Reloading Dynmap...");
                 reload();
diff --git a/src/main/java/org/dynmap/MapManager.java b/src/main/java/org/dynmap/MapManager.java
index 38db854d..5cf01cc8 100644
--- a/src/main/java/org/dynmap/MapManager.java
+++ b/src/main/java/org/dynmap/MapManager.java
@@ -165,6 +165,7 @@ public class MapManager {
         /* Min and max limits for chunk coords (for radius limit) */
         int cxmin, cxmax, czmin, czmax;
         String rendertype;
+        boolean cancelled;
 
         /* Full world, all maps render */
         FullWorldRenderState(DynmapWorld dworld, Location l, CommandSender sender) {
@@ -216,6 +217,10 @@ public class MapManager {
         public void run() {
             long tstart = System.currentTimeMillis();
             
+            if(cancelled) {
+            	cleanup();
+            	return;
+            }
             if(tile0 == null) {    /* Not single tile render */
                 /* If render queue is empty, start next map */
                 if(renderQueue.isEmpty()) {
@@ -345,6 +350,10 @@ public class MapManager {
                 cleanup();
             }
         }
+        
+        public void cancelRender() {
+        	cancelled = true;
+        }
     }
 
     private class CheckWorldTimes implements Runnable {
@@ -468,6 +477,30 @@ public class MapManager {
         sender.sendMessage("Render of " + radius + " block radius starting on world '" + wname + "'...");
     }
 
+    void cancelRender(World w, CommandSender sender) {
+    	synchronized(lock) {
+    		if(w != null) {
+    			FullWorldRenderState rndr;
+    			rndr = active_renders.get(w.getName());
+    			if(rndr != null) {
+    				rndr.cancelRender();	/* Cancel render */
+    				if(sender != null) {
+    					sender.sendMessage("Cancelled render for '" + w.getName() + "'");
+    				}
+    			}
+    		}
+    		else {	/* Else, cancel all */
+    			for(String wid : active_renders.keySet()) {
+    				FullWorldRenderState rnd = active_renders.get(wid);
+					rnd.cancelRender();
+    				if(sender != null) {
+    					sender.sendMessage("Cancelled render for '" + wid + "'");
+    				}
+    			}
+    		}
+    	}
+    }
+    
     public void activateWorld(World w) {
         ConfigurationNode worldConfiguration = plug_in.getWorldConfiguration(w);
         if (!worldConfiguration.getBoolean("enabled", false)) {