Boston bomb suspect's condition upgraded in hospital

Dzohkhar Tsarnaev has been charged in his hospital room at Beth Israel Deaconess Medical Center. Credit: FBI

The condition of Boston Marathon bombing suspect Dzohkhar Tsarnaev has been upgraded from "serious" to "fair", the US Attorney's Office has said, according to Reuters.

Read: Boston Marathon suspect could face death penalty

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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.