David Cameron has become the first serving UK prime minister to pay his respects at the scene of one of the bloodiest massacres in British history, BBC News said.
Cameron is visiting Amritsar in the state of Punjab on Wednesday February 20, at the end of a three-day trade trip to India.
This was where hundreds of people at a public meeting were shot dead by British troops in 1919.
The prime minister described the massacre as "a deeply shameful event in British history". Writing in the memorial book of condolence, he added: "We must never forget what happened here."
But he is not expected to offer a formal apology despite some calls for him to do so.
The killings were condemned by the British at the time – War Secretary Winston Churchill described them as "monstrous" in 1920.
During her visit in 1997, the Queen said it was a "distressing" example of the "moments of sadness" in the history between Britain and India.
