Three small explosions went off near a base housing international peacekeepers who patrol the Afghan capital, an official said Saturday. There were no casualties.

The explosions occurred Friday evening several hundred yards from the base in southern Kabul, home to German peacekeepers, said Mark Whitty, a spokesman for the International Security Assistance Force. He said peacekeepers believe the explosions were caused by rockets, but they were still investigating.

There were no casualties or significant damage, he said.

Rocket attacks against international and U.S. targets are not uncommon. The rockets are usually launched with crude timing devices, and rarely come close to hitting their targets.

The explosions came during a violence-marred week in Afghanistan and a day after U.S. special forces and Afghan intelligence agents uncovered an alleged plot to bomb U.S. and international targets, arresting three men in the capital and seizing explosive material.

On Friday, an explosion ripped through a bus in southern Afghanistan, killing at least 15 people. On Wednesday, U.S. special forces detained two men suspected of making bombs near the eastern Afghan town of Jalalabad.