'Explosions were terror attacks':Belgian federal prosecutor

General view of the Zaventem's international airport near Brussels in this February 20, 2013 file photo. [Photo/Agencies]

Brussels airport said it had cancelled all flights and the complex had been evacuated.

Salah Abdeslam, the prime surviving suspect for November's Paris attacks on a stadium, cafes and a concert hall, was captured by Belgian police after a shootout on Friday.

Belgium's Interior Minister, Jan Jambon, said on Monday the country was on high alert for a possible revenge attack following the capture of 26-year-old Abdeslam.

"We know that stopping one cell can ... push others into action. We are aware of it in this case," he told public radio.

French investigator Francois Molins told a news conference in Paris on Saturday that Abdeslam, a French citizen born and raised in Brussels, admitted to investigators he had wanted to blow himself up along with others at the Stade de France on the night of the attack claimed by Islamic State; but he later backed out.

Brussels Airport is cancelling flights and evacuating the airport area, it said on its Twitter account following the explosions.

"Don't come to the airport - airport is being evacuated. Avoid the airport area. Flights have been cancelled," the airport said..

Brussels Airport serves over 23 million passengers a year.