A roadside bomb in western Afghanistan killed three US coalition troops, while 18 Taliban fighters died in clashes elsewhere in the country, officials said on Thursday.
The bomb that struck the US coalition vehicle on Wednesday also wounded another coalition member, the US military said in a statement. It did not provide the exact location of the attack or the nationalities of the victims. The majority of the coalition troops are American.
Taliban militants regularly target Afghan, US and other foreign soldiers with roadside and suicide bombs in their campaign to weaken the government of President Hamid Karzai and its Western backers.
The number of insurgent attacks has been up by 30 per cent this year, compared to 2007.
In southern Uruzgan province, meanwhile, a US coalition air strike killed 15 militants on Wednesday, including a Taliban commander, another coalition statement said.
The militants were killed near a riverbed in Deh Rawood district, away from local villages, the statement said.
Another three militants were killed inside a cave in western Farah province's Bala Buluk district during a raid by American and Afghan troops on Wednesday, the US military said.
More than 5,200 people, mostly militants, have died in insurgency related violence this year, according to an Associated Press count of figures from Western and Afghan officials.