KABUL, Afghanistan (AP) – A roadside bomb killed one NATO soldier and wounded two others Sunday in southern Afghanistan, an official said.

The bomb exploded Sunday morning, said Lieutenant Colonel Maria Carl, a spokeswoman for NATO’s International Security Assistance Force. She declined to give further details about the victims or where the attack took place.

Earlier, the ISAF press office said there was an attack with some casualties in southern Zabul province, but would not confirm whether this was the same attack as the one Carl mentioned.

Also Sunday in eastern Nangarhar province, a suicide car bomber blew himself up next to an American-led coalition convoy, said Ghafor Khan, spokesman for the provincial police chief. Khan said no troops or civilians were killed or wounded in the incident.

Meanwhile in eastern Khost province, a gunman riding on the back of a motorcycle opened fire on Afghans working for ISAF, killing two of the men and wounding another, ISAF said in a statement.

The latest violence came days after more than 1,000 NATO and Afghan troops retook Sangin district in Helmand province, the world’s biggest opium-producing region.

The next step will be for NATO forces to hand over control of the area to Afghan security forces, Carl said, adding that NATO already has transported about 500 Afghan forces to the south.

The operation to retake the town from militants started late Wednesday and is part of NATO’s largest ever offensive in Afghanistan, Operation Achilles, launched last month to flush out Taliban militants from the northern tip of Helmand province.

About 4,500 NATO and 1,000 Afghan forces are in and around Helmand province as part of Operation Achilles. In the last several months, Taliban militants and foreign fighters have streamed into the province, according to American and NATO officials.