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(NEWSER) – The man suspected of shooting two Pennsylvania State troopers 10 days ago may have been planning both the shooting and his escape for months if not years, police say, perhaps explaining why he's been able to elude captivity for so long.

Even the clues uncovered yesterday in the huge manhunt—including an AK-47-style weapon, ammo, and other items believed to belong to suspect Eric Frein, now on the FBI's 10 Most Wanted list—may have been stored by Frein ahead of the ambush, reports NBC News.

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PHOTO: PASP/FBI/Splash News