[Freeswitch-users] How to kill multiple UUIDs.

Hi all, My situation is A called to 1005 -- Which executes an ESL program. Now from the program I will made the parallel call using "api originate [origination_uuid=uuid1]user/1006,[origination_uuid2]user/1001 &park()". UUID's are obtained from create_uuid. I'll then wait for the api to return, to check whether the call is answered or rejected by the other end. But while I'm waiting, if A hangup the call, I just want to kill the calls that are originated by my program. So I taught of using api_hang_up_hook and I set that variable to uuid_kill uuid1 uuid2. But it only killed the uuid1. Is there any other ways to kill multiple uuid's?? please help?