A man killed himself while detonating explosives after trying to enter Brazil’s Supreme Court, authorities said Wednesday, in an attack on the political heart of the country that prompted the evacuation of court staff and legislators in the capital Brasilia.

Brazilian Supreme Court Justice Alexandre de Moraes said on Thursday that the suicide bomber who tried to get into the top court on Wednesday had intended to blow up the building, casting it as part of a growing wave of attacks on democracy.