KABUL: Four Nato soldiers were killed Monday in a bomb attack in southern Afghanistan, one of the toughest battlegrounds in a nearly 10-year Taliban insurgency, the alliance said in a statement.

The US-led International Security Assistance Force (ISAF), Nato's mission in the war-torn country, did not provide the nationalities of the casualties, leaving it to their native countries to do so.

“Four International Security Assistance Force service members died following an improvised explosive device attack in southern Afghanistan today,” it said without giving any further details.