More than 400 police officers are on a massive manhunt for Eric Frein, one of FBIs Ten Most Wanted, after he allegedly ambushed troopers at a police post, killing one officer and injuring another.

Law enforcement is scouring the thick woods of Pennsylvania's Pocono Mountains where the 31-year-old fugitive is believed to be hiding. Police said they are "closing in" on the whereabouts of the suspect as residents wait anxiously for news of his capture.

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Reports said Frein ambushed a police barrack, injuring trooper Alex Douglas and killing state trooper Bryan Dickson earlier this month.

Media reports state that police found an AK-47, an assault rifle, and rounds of ammunition in the woods which they believe belongs to Frein.

State Police Colonel George Bivens told the media Monday that the police are making it hard for Frein and he is not safe anymore. He is confident that he will be captured soon. He added that the officers are narrowing their search and are "closing in" on Frein

A reward of $175,000 has been offered to anyone who can give information on his whereabouts.

Reports said Frein was a "coward" and had an axe to grind against police officers due to a past investigation he was involved in. The police refused to divulge details of the past encounter.

Pennsylvania Governor Tom Corbett said in a press conference that he was thinking of the police officers who are hunting Frein and that he hopes they are all safe.

The Governor further assured residents that the fugitive will be apprehended soon and stated that Pennsylvania should not cower in fear because the criminal is still on the loose.  

He said communities are putting in their share of security measures and are ready to fight the fugitive in case he emerges in the community.

TagsEric Frein, Pennsylvania, Tom Corbett, Most Wanted, barracks ambush, FBI, troopers, Fugitive