A Boston Marathon bombings survivor has told ITV News those responsible for the attacks should be handed the death penalty.
Marc Fucarile, who lost his right leg above the knee and broke his spine, Washington Correspondent Robert Moore: "You know they're sick, sick people. They killed people that didn't do anything to them and I think they should pay the ultimate sacrifice.
"I think that anyone that thinks in that direction should also pay the sacrifice".
Tamerlan Tsarnaev, who died in a shoot-out with police four days after the attacks, and his brother Dzhokhar have been accused of carrying out the Boston Marathon bombings.
Dzhokhar Tsarnaev has pleaded not guilty to 30 charges.
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Some children, particularly those who have been more directly affected, may show symptoms of stress and trauma.
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The threat level has been raised to critical by MI5's Counter-Terrorism Analysis Centre.