The Home Office has increased its powers to strip jihadists fighting in Syria of their British nationality.
A statement on Sunday night said: "Citizenship is a privilege, not a right, and the Home Secretary will remove British citizenship from individuals where she feels it is conducive to the public good to do so."
Benjamin Ward, deputy director of Human Rights Watch Europe and Central Asia Division, said: "If there is a national security dimension to the stripping of citizenship and if that is something that would be known to the other country of nationality, then that would give rise to concern.
"It's obviously very important that in looking at these issues the Government complies with its human rights obligations."
More top news
Cricket stars, celebrities and fans have joined a social media campaign paying tribute to Phil Hughes by leaving their cricket bats out.
Eight out of 10 asthma sufferers are not getting enough clinical care, a leading health charity has found.
Phillip Schofield has revealed that an eccentric fan who wanted to marry him arranged a wedding - leaving him with the bill.