Six Afghan police were killed Sunday in a Taliban raid helped by an "insider", officials said, in the latest such attack to hit Western-trained security forces.
The militants stormed a police post in the Deh Yak district of central Ghazni province and killed the six officers as they slept, an official said.
"One of the police who had links with the Taliban let them into the post while other police were sleeping," district chief Fazul Ahmad Tolwak told AFP.
"The police officer who led the Taliban into the post joined the Taliban after the attack and went with them."
He said one officer was wounded but survived. Another police officer was detained over suspected links to the attack and was being investigated, he said.
Fazul Sabawoon, a provincial spokesman, confirmed the incident and said six officers -- part of the Afghan Local Police, a US-funded community force -- were killed in the pre-dawn raid.
He also blamed an "insider" for the attack.
More than 60 foreign soldiers were killed in 2012 in insider attacks that have bred mistrust and threatened to derail the training of Afghan forces ahead of NATO's withdrawal next year.
Scores of Afghan forces have also died in the attacks. The threat has become so serious that foreign soldiers working with Afghan forces are regularly watched over by so-called "guardian angel" troops.
In a separate attack Sunday claimed by the Taliban, a suicide bomber killed three civilians and wounded seven other people including two police in the Jani Khil district of the eastern province of Paktika.
Ehsanullah Sadat, a former governor of the district, was among those killed when the bomber blew himself up outside a shop, said provincial spokesman Mokhlis Afghan.