Officially, the FBI has not released many details about the bomb, other than that it was viable and could have caused multiple casualties.
An FBI official yesterday told TPM the bomb was an act of "domestic terrorism."
It was found Monday morning in a parking lot along the parade route, just half an hour before the parade was to begin. Three city workers who found the backpack it was stuffed in called the police, who sealed off several blocks and rerouted the parade. The FBI dismantled the bomb and is handling the investigation.
The FBI also says it's gotten "a number of important, fruitful leads," but has not released any details about a possible suspect or motive.