A US air strike killed at least eight policeman in Afghanistan's Helmand province, a government official said on Friday, the latest casualties from a rise in air and ground operations against the Afghan Taliban.

An American military spokesman called the deaths a ‘tragic accident’ that occurred after Afghan security forces requested US air support for an operation against the Taliban.

Omar Zwak, a spokesman for Helmand’s governor, said at least eight policemen were killed in the strike conducted by American forces on Thursday night.

Two senior officers were among the eight policemen killed. Another 11 policemen were wounded in a firefight with Taliban insurgents during the same security operation.

Colonel David Butler, a spokesman for US Forces- Afghanistan, said that during heavy fighting with the Taliban near the provincial capital Lashkar Gah, the Afghan National Defense Security Forces requested the US precision air support.

‘We deconflicted the requested support with an Afghan coordination unit to ensure the areas were clear of friendly forces. They (Afghan forces) reported and confirmed the areas were clear of friendly forces,’ said Butler.

‘Unfortunately, they were not and a tragic accident resulted. Afghan security forces as well as Taliban fighters were killed in the strikes,’ he said.

Afghanistan's largest private TV station Tolo News reported that 17 police officers were killed and 11 others were wounded.

American forces regularly provide support to Afghan troops in operations against the Taliban.

The US official said they did not have the breakdown of the toll of people killed by the Taliban and in the air strike.

‘We are examining the miscommunication to ensure it is not repeated and regret this tragic loss of life of our partners and are committed to improvement every day with every mission,’ said Butler.

Helmand Governor Mohammad Yasin and government officials in Kabul said the air strike was being investigated. They did not give details of the incident.

The Taliban insurgents control or contest more than half of Helmand’s districts and regularly deliver heavy blows to Afghan forces, who have been struggling to hold off insurgents across the country. Fighting has accelerated during a series of peace talks aimed at ending more than 17 years of war.

In March, Taliban fighters attempted to overrun a US-Afghan base in Helmand before they were repelled.

The Taliban has so far rejected ceasefire proposals, saying US and NATO troops must first withdraw from Afghanistan.

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