Terrorist group's claim to have killed kidnapped journalist have not been confirmed.
A Palestinian group claims to have killed BBC journalist Alan Johnston, but so far the claims have not been supported.
Previously unknown group "the brigade of Tawhid and Jihad" contacted news organizations claiming to have killed Johnston a month ago, but reports cannot be confirmed.
So far it is not clear if there is any connection between the group making the claims and Al-Qaida, which was known as Tawhid and Jihad before the name was changed.
Since his kidnapping on March 12, Palestinian journalists have protested for Johnston's release.