Indonesian, probably.
This seems like a test run of some sort....Can someone speculate? Since the team members will be red listed from other flights, I imagine their work is done, and they will report to their superiors what took place so the the "real" group can perform the dastradly deed.
I don't understand the purpose of handing the cell phones to one guy unless the cell phones could be opened up and contained bomb making material. Watch for a ban on cell phones and lap tops on planes now....
These guys will be arrested and detained for a short while then released since they didn't do anything illegal.