At least one person was killed on Wednesday after two explosions near the Supreme Court in Brazil’s capital, Brasília.

The explosions, which were 20 seconds apart, happened around 7:30 p.m. local time, Celina Leão, vice governor of the Federal District, said at a news conference on Wednesday evening.

The first explosion occurred in a car in a nearby parking lot, Ms. Leão said. Soon after, another explosion occurred in the plaza outside Brazil’s Congress, Supreme Court and presidential offices.

President Luiz Inácio Lula da Silva was not at the site at the time of the explosion.

The suspect had attempted, but failed, to enter the building housing the Supreme Court, Ms. Leão said.

Images from the scene showed the body of a casualty in the plaza, which is known as Three Powers Square. Firefighters confirmed that one person had been killed, although they had not yet removed and analyzed the body because of concerns over additional unexploded devices.

Military police and anti-bomb squads were sweeping the area.

This is a developing story.