DUBAI: Emirati security authorities have allowed all passengers on an Etihad Airways flight that was the scene of suspicious lavatory fires to leave after several were temporarily detained for questioning by police, the airline said Thursday.

Passengers onboard the Boeing 777-300ER flight from Melbourne, Australia, to Abu Dhabi said Tuesday’s fires sent smoke into the cabin and appeared to have been deliberately set.

Smoke was detected in two toilets after takeoff from Melbourne, prompting a precautionary diversion to Jakarta, and again in a toilet as the plane made its way to its destination of Abu Dhabi.

None of the 254 passengers and crew was removed from the flight in Indonesia. Twelve people were detained upon arrival in Abu Dhabi as authorities investigated the case.