Aug 6 (Reuters) - Following are security developments in Afghanistan at 1400 GMT on Wednesday:

* denotes new or updated item

* FARAH - Taliban insurgents killed four Afghan security guards working for U.S. company USPI in an ambush in the western province of Farah on Wednesday, the district governor said.

FARAH - An improvised explosive device (IED) killed a U.S. Marine on patrol in Farah on Monday, the U.S. military said on Wednesday.

MAIDAN WARDAK - The NATO-led force killed and wounded "some" insurgents and destroyed two vehicle-borne IEDs in air strikes in Wardak province on Tuesday, the NATO force said on Wednesday.

FARAH - The Afghan national army killed four Taliban militants on Wednesday in Farah, the Defence Ministry said.

MAIDAN WARDAK - Insurgents ambushed soldiers from NATO-led forces on a road in Maidan Wardak province on Tuesday, the alliance said, and a suicide car bomber hit a vehicle of the force during the attack. There were no alliance casualties from either incident, the alliance said.

KAPISA - U.S.-led coalition forces killed several insurgents in an operation on Tuesday in Kapisa province which lies to the northeast of Kabul, the U.S. military said.

HELMAND - Taliban insurgents have suffered "heavy casualties" in a clash with Afghan troops in southern Helmand province during the past 24 hours, the Defence Ministry said in a statement. It did not give any figure, adding the clash occurred after the insurgents ambushed the troops. Two government soldiers were wounded, it said.

* BAGHLAN - A suicide bomber on a motorcycle attacked NATO troops in the northern province of Baghlan on Wednesday, wounding some of the soldiers, the alliance said (Compiled by Sayed Salahuddin; Editing by David Fox)

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