The Ministry of Defence said "inappropriate actions will not be tolerated" after photos emerged appearing to show an RAF serviceman giving a thumbs-up sign next to the body of a dead Taliban fighter.
An MoD spokesman said:
Inappropriate actions will not be tolerated in the armed forces; the RAF is treating this incident extremely seriously and has launched a military police investigation.
As this incident is subject to an ongoing investigation it would be inappropriate to comment further at this time.
More top news
A prison officer - who was allegedly assaulted by a prisoner at a crown court - has died.
The body of the girl, who is thought to be about four, was found washed up in a bag in Boston.
Australian Rules football has been left in shock after the son of Adelaide Crows coach Phil Walsh was charged with his murder.