Afghan police officer drugs, kills 17 colleagues

KABUL (Reuters) - An Afghan police officer drugged 17 colleagues and shot them dead on Wednesday with the aid of the Taliban, police said, the latest in a series of so-called "insider" attacks involving Afghan security forces and the Taliban.

The attacks have undermined trust between coalition and Afghan forces who are under mounting pressure to contain the Taliban insurgency before most NATO combat troops withdraw by the end of 2014.