loading multiple collada objects at the same time Three.js - three.js

Question

i have to load the same collada object multiple times.
Here is the code
var ai = [];
function setupAI() {
var c = getMapSector(cam.position);
var loader = new THREE.ColladaLoader();
loader.options.convertUpAxis = true;
loader.load('models/monster.DAE',function colladaReady( collada ){
var op = collada.scene;
skin = collada.skins [ 0 ];
for (var i = 0; i < NUMAI; i++) {
var o = THREE.SceneUtils.cloneObject(op);
o.scale.x = o.scale.y = o.scale.z = 0.006;
o.updateMatrix();
do {
var x = getRandBetween(0, mapW-1);
var z = getRandBetween(0, mapH-1);
} while (map[x][z] > 0 || (x == c.x && z == c.z));
x = Math.floor(x - mapW/2) * UNITSIZE;
z = Math.floor(z - mapW/2) * UNITSIZE;
o.position.set(x, UNITSIZE * 0.15, z);
o.health = 100;
//o.path = getAIpath(o);
o.pathPos = 1;
o.lastRandomX = Math.random();
o.lastRandomZ = Math.random();
o.lastShot = Date.now(); // Higher-fidelity timers aren't a big deal here.
ai.push(o);
scene.add(o);
}
});
}
but this gives error in this line
var o = THREE.SceneUtils.cloneObject(op);
but if i put loader inside the loop it becomes heavy and not load in browser.