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KABUL, Afghanistan (AP) - NATO says that two service members have been killed in separate attacks in southern Afghanistan, while two others have died of non-battle injuries.

The coalition said in statements that one service member was killed by an improvised explosive device Wednesday and another by a similar weapon on Tuesday.

NATO said the two other service members died of non-battle injuries, one in the south on Wednesday and another in the east on Tuesday.

The U.S.-led coalition did not provide their nationalities nor disclose other details.

So far this month, 31 coalition members have died in Afghanistan, bringing the year's toll to 122.