Just in from [1] Reuters:

DUBAI (Reuters) - An Islamist website which has posted unsubstantiated claims about hostages in the past says that a group led by al Qaeda ally Abu Musab al-Zarqawi has killed British construction engineer Ken Bigley.

The Foreign Office said it believed the website lacked credibility and it had nothing to confirm such a claim.

Alezah website, which earlier this week carried a widely dismissed statement claiming the deaths of two Italian aid workers, did not accompany its brief chat room posting with a statement or video tape from Zarqawi's Tawhid and Jihad group.

"Tawhid and Jihad announced the killing of the Briton and kidnapping of seven British soldiers," said a statement posted on Alezah's chat room, adding that a video would be posted soon.