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 / Updated  / Source: NBC News

A teenage boy and girl suspected of preparing for acts of terrorism were arrested in northern England, British police said Saturday.

The 14-year-old boy was arrested on suspicion of preparing for acts of terrorism in the county of Lancashire Thursday after investigators examined "a number of electronic devices," the Greater Manchester Police said in a statement. On Friday a 16-year-old girl was arrested in the city of Manchester "on suspicion of engaging in conduct in preparation for acts of terrorism," the statement said.

Police said both teens were arrested as part of an investigation involving counter-terrorism and police agencies, but it was unclear whether the pair was related in any way. Both are out on bail until May 28, the statement said.

The U.K. raised its terror threat level from substantial to severe last August, in part because of home-grown extremists, who might travel to Syria or Iraq and wage attacks on the West, according to the U.K.'s Joint Terrorism Analysis Center.

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