Unknown assailants have fired rocket propelled grenades at the military academy near Osama bin Laden's compound in the Pakistani city of Abbottabad, causing damage but no casualties, police said.
It was the first attack in the normally peaceful north west city since US Navy Seals killed bin Laden during a daring night raid on his compound last May.
The grenades damaged a wall of the academy, said senior local police officer Abdul Karim.
The operation against bin Laden outraged Pakistani officials because they were not told about it beforehand.
Many US officials questioned how bin Laden could live for years near Pakistan's equivalent of West Point. But the US has not found evidence senior Pakistani leaders knew he was there.
On Thursday, Iranian security forces killed six Pakistani traders taking goats into Iran, a Pakistani official said. Iranian officials were not immediately available for comment.
The incident happened on the Iranian side of the border near the south eastern Pakistani town of Gwadar, said its deputy commissioner Abdur Rehman.
Mr Rehman said Iranian authorities were not releasing the bodies. He gave no more details.
Earlier this month, Iranian security personnel allegedly crossed into south west Pakistan and killed one man. There is occasional violence along the poorly marked border, where smuggling, banditry and terrorism are rife.
The incidents do not appear to have affected Islamabad's relations with Tehran, which are based on larger regional interests.