Officials in Afghanistan say a suicide bomber has killed nine policemen and wounded 25 others in the northern part of the country.

An Interior Ministry spokesman says Monday's attack occurred next to a police station in the city of Kunduz, where militant attacks are rare. The officers were outside doing morning exercises when the bomber struck.

Authorities initially reported 10 deaths.

The suicide attack, 250 kilometers north of Kabul, is the third in Afghanistan in as many days.

On Sunday, a suicide bomber in southern Kandahar province killed four Afghan employees of a U.S.-owned private security firm in an attack on the company's convoy.

A suicide attack Saturday outside a police station in eastern Afghanistan's Khost province killed seven policemen.

U.S.-led coalition forces killed at least 16 Taleban militants in gunbattles Saturday and Sunday.

Suicide bombings in Afghanistan have increased sharply in the last year. In 2006, the country experienced the highest number of rebel attacks since the Taleban was ousted from power by the U.S.-led coalition in 2001.

Some information for this report provided by AP, AFP and Reuters.