A group of Sikhs in UK protested outside the Houses of Parliament as part of a campaign to end the death penalty in India.
The protest organized by campaign group Kesri Lehar condemned the death sentences imposed on four Sikhs in India, including one convicted for killing an Indian
According to the BBC, the protests on Saturday aimed to draw attention to the fate of Bulwant Singh Rajoana, who was sentenced to death in 2007 for his role in the 1995 assassination of Beant Singh, the chief minister of Punjab state, in India.
Meanwhile, the Indian High Commission in London said the death penalty had been challenged repeatedly.
It added that the Supreme Court found the penalty to be valid under the country's constitution.
Beant Singh was killed on 31 August 1995, along with 17 others by a suicide bomber identified as Dilawar Singh.
Rajoana was convicted of acting as a back-up suicide bomber should Singh have failed.
Rajoana, whose hanging was postponed by Indian officials in March 2012, has not appealed against his sentence.