Boston bombs 'remote trigger'

US investigators have revealed the two bombs that went off at the Boston Marathon were detonated with the kind of remote control device used for a toy car.

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Report: School friend says suspects were 'normal' kids

Local TV station CBS Boston cites a high school friend of the two brothers suspected of this week's bombings as saying they were "normal" kids.

He reportedly described them both as keen athletes who enjoyed wrestling and boxing.

He said that Tamerlan Tsarnaev, who died in a shoot-out earlier today, was “a two-times golden gloves champion” who was “asked many times to go pro but he kept declining.”

The other brother Dzhokhar, who is still thought to be on the run, was reportedly “a wrestler that won many awards” including a college scholarship.

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