A US security contractor has been kidnapped in eastern Afghanistan, an official confirmed Thursday, the latest instance of a foreigner being taken in the war-torn country where abductions are common.

An Afghan security official with knowledge of the incident told AFP the former US Navy member had been working in Afghanistan as a contractor when he was abducted last week in eastern Khost province, near the Pakistani border.

There was no indication whether a militant group or a criminal organisation was behind the kidnapping, while the Taliban told AFP they had "no information" about the matter.

Afghanistan's former intelligence chief Amrullah Saleh was quick to blame the insurgents, saying on Twitter the abduction had been orchestrated by "the Taliban & their Pakistani backers. Kidnapping must end & end without ransom".

Pakistan has long been accused of backing the Taliban but has repeatedly denied supporting the group.

The US State Department said it was aware of reports of the kidnapping, but declined to comment further.