KABUL-
Afghan Taliban fighters stormed a police checkpoint overnight in southern Afghan province of Helmand, killing four policemen, an official said.
Deputy district Governor Mohammad Rassoul said the attack happened in Sangin district and that the Taliban have captured the checkpoint.
Rasssoul said the government forces are trying to retake the post and that clashes are under way at the location between Afghan police and the Taliban.
The attack took place as US Secretary of State John Kerry was in Kabul on Friday for talks aimed at preventing the fragile country from collapsing into political chaos after disputed elections.
Kerry, who arrived the day before, is to urge two contenders from the presidential election runoff to accept results of an ongoing audit of all ballots and form a national unity government by early September.