Two British nationals have reportedly been caught up in a violent crackdown in Pakistan-administered Kashmir -- one shot dead, another held in prison for more than two months without charge.

Mohammad Akhtar, 50, from Peterborough, was killed on Jun 9 in the city of Kotli after security forces opened fire near a protest demanding economic and electoral reforms.

His family say he was not taking part in the demonstrations and was struck by a stray bullet outside his home, reports The Guardian.

His cousin Mohammad Saad said the family chose not to pursue the matter with British authorities, fearing reprisals.

They were also unable to register a police complaint locally.

Waqas Arif, 38, from Nottingham, was detained in Mirpur on Jun 5 after protests in the area. His family insist he was not involved.

His sister Sumera said Pakistani forces came to the family home and took away her brothers, including Arif, without explanation.

"There is no charge. He hasn't done anything," she said, adding that thousands of others had been similarly detained to suppress protest activity.

British consular staff have confirmed Arif is in good health through prison officials but have not been able to speak to him directly.

The UK Foreign Office said it was deeply concerned by the situation and that ministers and the high commissioner in Islamabad were engaging with their counterparts.

Travel advice was updated on Aug 7, advising against all but essential travel to affected areas.

Pakistan declared the protest group the Joint Awami Action Committee a terrorist organisation and imposed a communications blackout in the region from Jun 5.

Security forces have been accused of killing at least 30 people during demonstrations -- allegations the government rejects.

Elections in the region, which began on Jul 27, have been repeatedly disrupted by the unrest. The JAAC has called the vote a sham held at gunpoint.

Pakistan's foreign ministry and its London high commission did not respond to requests for comment.