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An Argentine federal prosecutor who accused President Cristina Fernandez de Kirchner last week of a cover-up has been found dead at his home in the capital, Buenos Aires, the BBC reported.

Alberto Nisman was investigating the 1994 bombing of a Jewish centre in Buenos Aires in which 85 people died.

On Wednesday, he accused the president of involvement in a plot to cover up Iran's alleged role in the bombing.

The president's spokesman dismissed the allegations as "ridiculous."

Mr Nisman, 51, was found dead by his mother in the bathroom of his home.

The Security Ministry released a statement saying that Mr Nisman's bodyguards had raised the alarm after he failed to answer their phone calls on Sunday.

Concerned about his welfare, they fetched Mr Nisman's mother and tried to enter his apartment, the statement said.

They found the door locked from the inside with a key still stuck inside.

After a locksmith gained access, they found Mr Nisman's body in the bathroom.

According to the statement, a gun and a cartridge shell were found next to his body.