Taliban soldiers ambushed a government post in southern Afghanistan killing three Afghan soldiers, a security official said Thursday.

The soldiers at Sherabik post, near the Pakistan border, were ambushed early Wednesday and stabbed to death by attacking Taliban, Abdul Razzak Panjshiri, security chief of Spinboldak said. Five Taliban attackers were arrested, he told The Associated Press.

Attacks in southern Afghanistan, the former spiritual headquarters of the deposed Taliban regime, have been on the increase in recent weeks.