British Prime Minister David Cameron is urging his nation’s schools to guard against the influence of extremism after three school-aged girls slipped out of the country in a suspected attempt to join the self-declared Islamic State.

The Associated Press reports that Cameron said the teenagers’ disappearance was deeply concerning.

“We all have a role to play in stopping people from having their minds poisoned by this appalling death cult,” Cameron said.

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The latest case involves three girls, aged 15 to 16, who flew from London to Turkey on Tuesday without leaving any messages.

As the BBC reported on Friday:

"The girls were last seen at their homes on Tuesday morning when they gave their families "plausible reasons" to be out for the day, police said."They boarded a Turkish Airlines flight, which landed in Turkey on Tuesday evening."

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