A suicide bomber has blown himself up at the entrance to the headquarters of Pakistan's navy in Islamabad, killing a security officer, officials have said.

A suicide bomber killed six senior Revolutionary Guards commanders, including two of its top officers, and 25 other people on Sunday in one of the boldest attacks against Iran's most powerful military institution.

A suicide attack at the offices of the World Food Program in Islamabad killed three employees and wounded five others Monday, an agency official said.