BRUSSELS— At least 34 people have died and 200 have been wounded in Tuesday's attacks at Brussels airport and metro station, according to the Belgian Minister of Health, Maggie De Block and Yvan Mayeur, mayor of the Belgian city.

The attack on Maelbeek, located near the headquarters of the European Union institutions, killed at least 20 people and wounded 106 others, the mayor said at a news conference.

The two explosions in the departure hall of Zaventem airport caused at least 14 deaths and wounded 94.

There are about 17 in a very serious condition, 23 in a serious condition and 66 with minor injuries, according to Mayeur.

The wounded have been sent to different hospitals in the Brussels region and neighboring Brabant and Walloon.

Meanwhile, the Belgian Tihange nuclear power station (east) has been evacuated, according to the Belga news agency quoting the police.

"Our country and citizens have been attacked by violent and cowardly attacks...It is a black day for Belgium," Belgian Prime Minister Charles Michel said at a press conference.

The federal prosecutor's court of Brussels has confirmed that the explosions at Zaventem airport and the metro were two separate suicide attacks.

Belgian authorities have raised the city terror alert to the maximum level 4, with thousands of police dispatched to the streets.

All trains arriving or departing from Brussels have been canceled and people have been urged to stay home.

The series of explosions at transport hubs comes just four days after the arrest in Brussels of Salah Abdeslam, the main suspect in the Paris terrorist attacks in Nov. 13, which killed 137 people and wounded more than 400.

After his detention, Belgian police have been on alert to prevent possible terrorist activities.