An explosion went off at an Istanbul Airport early in the morning on December 23 killing a cleaner on a Pagasus Airlines plane.

The tragedy took place at Sabiha Gokcen, Istanbul’s second airport located on the Asian side, according to Reuters.

The debate now is whether or not a bomb was the cause.

The explosion caused damage to a total of five planes from shrapnel. Turkey’s transport minister said that “weakness in the airport’s security is out of the question and all international security standards are being implemented“.

The airport, owned by Malaysia Airports mentioned more than one explosion. Luckily no passengers were in the area at the time.

Armed police were seen at airport which had tighter security measures. Vehicles were also being searched.

Find out more from Reuters here.