Islamic State claimed responsibility for two bomb attacks that killed at least 30 people in Brussels on Tuesday, Reuters reports.

"Islamic State fighters opened fire inside Zaventem Airport, before several of them detonated their explosive belts, as a martyrdom bomber detonated his explosive belt in the Maalbeek metro station," the Amaq agency said.

According to a statement released by ISIS, the attacks were retaliation for Belgium’s involvement in a military coalition against ISIS.  

It was reported earlier that terror attacks occurred at Brussels’ Zaventem airport and Maalbeek subway station on March 22. Two blasts occurred near an American Airlines desk at the airport’s departure lounge and another one outside a subway station near EU institutions.  One more blast was reported at the Schulman Square subway station.

The terror attacks left at least 31 people killed and 250 injured.

The Belgian government has officially recognized the attacks, which left 34 people killed and 200 injured, acts of terrorism.

The attacks might have been retaliation for a March 18 arrest of Salakh Abdesalam, a man suspected of masterminding terror attacks in Paris.