The Foreign Office has confirmed that two British nationals were killed in the suicide attack in Kabul, Afghanistan.
One of the victims has been named as Dhamender Singh Phangurha, the office added.
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The boat capsized on Table Rock Lake on Thursday night.
He had been on the run for five days.
His evidence will make it clear he was unaware of the nature of Peter Ball’s behaviour until 2015, Clarence House said.