Two aircraft landed safely at Brussels' Zaventem airport after receiving bomb threats, according to local reports.

Bomb alerts were reported on two flights operated by the Scandinavian airline SAS, Belgian broadcaster VRT said.

The planes, travelling from Oslo and Arlanda, Sweden both landed safely last night.

Bomb alerts have been reported on two passenger planes due to land shortly at Brussels Airport, according to local reports. Pictured, passengers outside the airport in May

State prosecutor Eric Van Der Sypt said his office had received information about possible bomb alerts and had opened an investigation, but declined to provide details. He said the bomb squad had not been called to the airport.

Other reports suggested the threats were made over Twitter.

An airport police spokeswoman said no bomb alerts were in place and that there was no problem at the airport.

Dutch sports journalist Bart Raes said he was on board the Oslo flight and confirmed it has landed.

Writing on Twitter, he said the threat came in about 20 minutes before landing.

Raes added that all passengers had been evacuated from the plane.

Belgian media said some other planes had been diverted to other airports.

Both planes have landed safely. They were operated by the Scandinavian airline SAS, with one from Oslo and the other from Arlanda, in Sweden

The bomb alerts come at a time of raised tensions in Belgium, which has been the victim of a series of terrorist attacks.

In March, 32 were killed when suicide bombers attacked the main terminal of Zaventem international airport, in the north-east of the city.

Many more were injured in the attacks and three bombers also died.