A four-year inquiry into the 1985 bombing of an Air India flight is due to be published. The inquiry was ordered after the acquittal of two suspects and allegations of a bungled investigation by the Canadian police and intelligence services.
Air India flight 182 from Canada to India blew up off the Irish coast, killing all 329 people on board - most of them Canadian citizens visiting relatives in India - on 23 June 1985.
Around the same time, a second bomb exploded prematurely in Japan, killing two baggage handlers.
The bombings - widely believed to have been carried out by Canadian-based Sikhs in retaliation for India's deadly 1984 storming of the Golden Temple, the holiest shrine in the Sikh religion - remain Canada's deadliest terror attack.
But the trouble began even before 23 June.
On 4 June, members of the Canadian secret services followed two men to some woods on Vancouver Island.
