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(CNN) – The Pennsylvania State Police Commissioner said the fear of not catching trooper-killing Eric Frein plagued him.
"I worried about that every night," Commissioner Frank Noonan told CNN.
"The most important thing that I was worried about is I was sending a lot of great people, good friends of mine into the woods, and he had a sniper rifle, and we knew that he may have explosive devices, too," he said.
The manhunt for Frein, accused of killing a Pennsylvania state trooper, ended Thursday night. Heavily armed U.S. marshals captured him and turned him over to state police, who slapped the slain officer's cuffs on him, put him in the back of the trooper's squad car and sent him back to the barracks where the ambush occurred.
"Our plan was to search every square inch of this expansive wooded area that he was familiar with. And eventually we kept moving him, and moving him, and eventually we were able to catch up with him," said Noonan.
For more of our interview with Pennsylvania State Police Commissioner Frank Noonan, check out the video above.