KABUL, Afghanistan -- NATO says four service members have died in southern Afghanistan in the past two days.

The alliance says one service member died in an insurgent attack and another in a bomb blast on Saturday. The two other service members died Sunday in a traffic accident in the south.

The coalition did not identify the nationalities of the dead or give further details. NATO forces usually wait for individual nations to identify their dead.

Separately, the coalition says a NATO helicopter made a forced landing in the south on Saturday. It said no one was killed and that initial reports said there was no enemy activity in the area.

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