A Turkish Airlines Airbus A330 jet flying from New York City to Istanbul was sharply diverted mid-air and landed in Halifax, Canada due to a bomb threat. Firefighting crews and police have evacuated the aircraft.

256 passengers and crew have been moved to the terminal building, and “all is going smoothly,” the emergency services stated on their Twitter account.

Canadian emergency services and Royal Canadian Mounted Police are responding to the situation, East Hants Fire Service Dispatches reported on Facebook. The fire department earlier tweeted that a bomb threat has been made.

The flight in question is Turkish Airlines TYH2 / TK2. While the nature of the threat has not been confirmed, plane watchers on social media have speculated it may have been made online.

Update DIVERSION Turkish #TK2 diverted to Halifax. Aircraft is stop in remote area of airport at Rwy 23/Taxiway Alpha. Authorities on scene — Publimetros (@publimetros) November 22, 2015

An investigation into the bomb threat is currently taking place, they added.

*** BREAKING **** Another plane diverting to HIAA with a reported BOMB THREAT ..... HRM fire, Airport Fire, EHS, and RCMP are all responding Posted by East Hants Fire Service Dispatches on Saturday, November 21, 2015

DIVERSION Turkish #TK2 diverting to #Halifax. Authorities awaiting aircraft. Planning to isolate on landing. pic.twitter.com/HnifuHlbwm — Tom Podolec CTV News (@TomPodolec) November 22, 2015

Update: #TK2 diverting to Halifax due to a threat made against the aircraft. https://t.co/CcBPY9WlKHpic.twitter.com/dasGRm8K2w — Flightradar24 (@flightradar24) November 22, 2015

Six hours after the emergency landing, the plane with all but five passengers on board safely departed from the Halifax Stanfield International Airport to Istanbul, a CTV reporter in Halifax said on Twitter.

Turkish Airlines flight 2 has departed @HfxStanfield for Istanbul nearly 6 hours after it arrived. All but 5 passengers on board. — Kayla Hounsell (@KHounsellCTV) November 22, 2015

After a thorough search no explosives were found, Canadian police in Nova Scotia reported.