Hospital sources in southern Afghanistan says suspected Taleban insurgents on motorcycles have attacked a police checkpoint, killing five officers and wounding three.

A doctor at the hospital where the victims were taken says the ambush occurred Sunday on the outskirts of Kandahar city.

Meanwhile, in neighboring Helmand province, a Taleban militant, posing as a traveler looking for a place to spend the night, killed four policemen after eating dinner with them.

Local authorities say the assailant shot the officers after they had gone to sleep late Friday.

In the same province Saturday, Taleban insurgents torched four fuel trucks delivering supplies to coalition forces. Local authorities say the drivers were not harmed.

Violence has escalated since the Taleban vowed to wage a spring offensive against foreign and Afghan government troops.

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