An evening gun attack at Camp Bastion, the main Allied base in Afghanistan, has caused injuries and damage.
Early indications suggest the assault was on the north-east side of the military compound in Helmand Province, which houses American forces in Camp Leatherneck.
A spokesman for the Isaf coalition in Afghanistan confirmed there was an attack "involving small arms fire. It has caused some injuries and damage."
A Ministry of Defence spokesman said: "We are aware of an incident that has taken place at Camp Bastion, which is currently being dealt with."