Nearly 20 British Muslim families may have been refused entry into the US this year despite UK's visa waiver programme with the US, according to media reports.
"There are now a number of examples of British citizens who happen to be of the Muslim faith being refused entry to the US without explanation. I will be writing to the US ambassador seeking a full explanation and if this is not forthcoming I will recommend to the committee that we call him to give evidence," Vaz, chair of the influential House of Commons Home Affairs Committee, said.
Vaz's remarks followed reports that a British Muslim family of 11 on their way to Disneyland was stopped from boarding their flight to Los Angeles at London's Gatwick airport on Tuesday last week by US immigration officials.
Mohammed Tariq Mahmood, 41, his brother and their children aged between eight and 19 were given no reason why their permission to travel had been revoked.
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Their visas had been organised six weeks before they were due to fly.
A US Embassy spokesperson said: "We do not comment on the details of individual cases.