The Ministry of Defence said the soldiers were part of a patrol travelling along Route 611 between Forward Operating Base Ouellette and Patrol Base Lashkar Gah Durai in Nahr-e-Saraj when their vehicle was hit by an improvised explosive device.
Blowing dust forced the California Highway Patrol to close state Route 14 in the high desert Antelope Valley north of Los Angeles due to low visibility.
The statement said only that the incident may have happened Wednesday while coalition, NATO-led forces and Afghan National Security Forces were on a route-clearance patrol in the Ghormach district and responded to an insurgent ambush.