Dutch police have arrested three people following an explosion that killed six people and injured four in an apartment building in The Hague, the police said on Tuesday.

Dutch police say they have arrested three suspects who might have been involved in the explosion and fire that killed six people in an apartment building in The Hague over the weekend.

Dutch King Willem-Alexander and his wife Máxima visited the scene of the deadly blasts at an apartment block in The Hague on Monday, two days after the disaster struck. The king said he was shocked by the extent of the devastation in the residential area.

The blast, which the mayor of The Hague called an “unprecedented disaster,” killed six people on Saturday morning.

Dutch police said Tuesday they had arrested three people in connection with an explosion at an apartment block in The Hague that killed at least six people.