Yeah, watching the blame game is rather amusing.
The Canadians said it was caused by a lightning strike on the American side of Niagara. Then they said it was just a fire there. Soon afterwardds, they said it was in fact a fire at a nuclear plant in Pennsylvania. Then they said it was not a fire, but an outage. After this accusation was called 'bizarre' by the Americans, as it was blatantly not true, the Candians eventually settled by saying it was some problem, somewhere, with one of the plants in the north-east US. Apparently.
Not wanting to be outdone on the wild accusations the US played their part rather well. At first they blamed a general power transmission problem in Canada, but that wasn't weird enough so THEN they went on to blame, of all things in all places, a lighting strike in obviously unaffected Quebec. I am sure there is SOME logic behind that accusaton but it has not been made clear to me.
Of course, it is people that speak rather than countries; on the Canadian side it was the aide to Prime Minister Jean Chretien, and then the defence Minsiter John McCallum and his spokesman, both of whom are probably rather wishing they had stayed quiet, whilst on the American side no less a people than Hilary Clinton and Michael Bloomburg were making their confident assertions...