Two senior SAS soldiers have been arrested on suspicion of murder following an alleged unlawful killing in Afghanistan, it has been reported.

The men - who are believed to be a lieutenant colonel and a warrant officer 2nd class - were detained by military police at the elite unit's HQ near Hereford last week.

The allegations are understood to relate to an unlawful killing in Afghanistan in 2009.

An insider told The Sun that the claims originate from a former Afghan solider who was part of a unit that went on missions with the British Special Forces.

According to the newspaper's report, the suspects have been released on bail and one has already been told he is no longer part of the investigation.