The massacre became a symbol of colonial cruelty and for decades Indians have demanded an apology from Britain, including during Queen Elizabeth's visit to Amritsar in 1997.

A commuter train travelling at high speed struck a crowd of people seated on tracks in northern India on Friday and at least 58 were killed, Punjab state police and witnesses said.

The Golden Temple is the Sikh religion's most sacred shrines and also an important site for Canadian prime ministers to visit.