A man blew himself up with a bomb in front of the Supreme Court; Concern is growing over an important meeting

He had previously tried to enter the courthouse.

A man's suicide by detonating a bomb outside Brazil's Supreme Court has raised further security concerns in the country ahead of a meeting of the G20 group of heads of state in Rio de Janeiro in five days, Reuters reported.

The first of two explosions rang out on Wednesday evening in the parking lot near the courthouse, and after a few seconds, the second explosion rang out in front of the courthouse, where the man's body was found.

Federal District Vice Governor Celina Leão said preliminary information suggests the man killed himself with explosives after trying to enter the Supreme Court.

She said that the car, in the trunk of which the first explosion rang out, belonged to a man who committed suicide with explosives.

She said she hoped it was the work of a "lone wolf" but that she couldn't be sure.

The police said that they did not identify the dead man, because there was a risk that there were more explosives on his body.