A suicide attack in southern Afghanistan has killed five policemen and wounded at least three others.

Tuesday's bombing in the Spin Boldak district of Kandahar province near the Pakistani border targeted the convoy of a border police commander, who survived the attack.

Officials say the attacker was riding a motorcycle when he detonated his explosives outside of the police headquarters.

In other news, NATO reports a Canadian soldier with its International Security Assistance Force was killed and four others wounded in the Panjwayi district of Kandahar on Monday.

Elsewhere, a head-on collision of two buses killed at least 32 people Monday on the main road linking the capital, Kabul, and Kandahar city. At least 35 other people were injured.

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