The teen suspected of lying in the Boston bombings investigation can be released under strict conditions, the prosecutor said.
Robel Phillipos would have GPS monitoring, home confinement and $100,000 bond, Reuters is reporting.
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Mack entered her plea in federal court in Brooklyn. The judge refused a request by her lawyers to release her without bail.
Officers investigating a reported break-in on Friday found 22-year-old Roger Alvarado asleep in the pop star's home in Tribeca.
Billy Jeeves is said to have fled the scene in Hither Green, south-east London, after Henry Vincent was fatally stabbed by the pensioner.