[thouworm]

Here is one:

"As everybody's kind of standing in shock, three Boston PD detectives see this guy moving quickly out of the crowd...

They think he may be injured, but it turns out that most of that [blood] is from other people. But he does have burns on his hands," said Miller."

[April 16, 2013] Sources: Injured Saudi man not a suspect in Boston attacks

[penelopesire]

I wonder if a triggering mechanism could have burned his hands??