OK goeasy here we go -
As Captain, (without a confession from the numpty perpetrator):
1. Everyone off in Jakarta
2. Thorough security inspection of entire aircraft
3. All hand baggage, handbags, laptop bags, coats into the hold (or you're refused boarding)
4. Pat down of every passenger in the air bridge for lighters and matches, that include burkhas and tea towels
5. One crew member guarding every pair of toilets for remainder of flight
ONLY then, blast off for Abu Dhabi. (If you're not out of hours by then)
Anything less than that stinks of 'the unmentionable airline' interfering with the Captain's authority.