Security's been boosted at transport hubs across Belgium and Europe, following last month's terror attacks. There were accusations that not enough was being done by Belgian authorities to prevent the attacks.

Following the Brussels attacks which hit the city's international airport and a metro stop - security measures at all major transport hubs have been stepped up.

The second largest airport to service the capital is Brussels Charleroi - around 55 kilometers to the south of the city.

"Before entering the airport area the cars are checked and all passengers are checked first before entering the area by police and military and soldiers," said Vincent Grassa, spokesperson, Brussels Charleroi Airport.

"Upon arrival here at the airport they are asked to go to certain car parks just to make sure that all car parks are not congested. Because of the influx of passengers we have here at the airport. And before entering the terminal, only passengers can enter in the terminal and they are checked as well before entering."

This airport is taking 90 flights per day which is twenty more than usual to cover for Brussels international airport which is only running at a fifth of capacity following the explosions.

And at the Brussels midi station where Eurostar trains arrive from London and Paris, there are spot bag checks for some before entering the building.

Over in France, they're deploying no less than 3000 armed undercover police officers on French trains to prevent future attacks.

In Brussels, 39 of the 69 metro stations remain closed after the March 22nd attacks due to a lack of security personnel - the operator says they don't know when the network will be back up to full speed.

"Uniforms on the streets are important of course, they reassure populations, they reassure citizens, they demonstrate that the state is taking this seriously but lets be honest," said Pauline Massart, deputy director, Security and Global Europe, Friends of Europe.

"I think a lot of work is being by the intelligence community whether it's enough or it's being coordinated enough not only at national but also at European level, that remains up for debate."

The Belgian Prime Minster Charles Michel has said greater intelligence sharing should be the first priority for European nations - and many political factions in the EU are pushing for a record of every passenger who flies in or out of the European Union to track suspected terrorists.