"We are aware of what has happened in Brussels. Therefore you will see more police in the airport and at key points...
The death toll in the attacks on the Belgian capital rose to at least 31 with some 260 wounded
'We have raised security for flights from Europe to the highest level,' the carrier says
Belgian authorities were still checking whether the attacks were linked to Abdeslam's arrest, said prosecutor Frederic Van Leeuw
Public broadcaster VRT said 20 were killed in the metro train and 14 at the airport.