An image of a man wearing army fatigues and carrying two air rifles has been released by the Royal Canadian Mounted Police as they search for suspect Justin Bourque, after three officers were shot dead and two wounded in the Canadian city of Moncton, New Brunswick.
More top news
Five people were killed and dozens more were injured after a car and knife attack in the capital on Wednesday afternoon.
Among those expected to attend the ceremony will be former US President Bill Clinton and ex-Northern Ireland first minister Peter Robinson.
Five people have been killed and 40 injured after a car and knife attack in London on Wednesday.