Terror charge for alleged cop killer

• Frein claimed he shot two state troopers in bid change government, documents say


• Frein wanted to "wake up people, because it was all he could do," the documents say

(CNN) -- Suspected cop killer Eric Frein, who led police on a weeks-long manhunt in eastern Pennsylvania, was slapped with terrorism-related charges Thursday for allegedly admitting after his arrest that he shot two state troopers in a bid to change the government and "wake people up," according to court documents.

The 31-year-old survivalist and military buff was captured last month at an abandoned Pennsylvania airport and charged with the ambush shooting that left Cpl. Bryon Dickson dead and Trooper Alex T. Douglass wounded.

After his arrest, Frein allegedly told investigators that he "wanted to make a change (in government) and that voting was insufficient to do so, because there was no one worth voting for," according to affidavit filed in Pike County in support of the new charges.

Frein told an investigator that he "assassinated" one trooper and wounded another in an attempt to bring about that change in government and to "wake up people, because it was all he could do," the documents said.

In addition, investigators recovered a letter from Frein to his parents on a thumb drive in which he writes of revolution and complains that the United States "is far from what it was and what it should be"

"I have seen so many depressing changes made in my time that I cannot imagine what it must be like for you," Frein wrote in the letter. "There is so much wrong and on so many levels only passing through the crucible of another revolution can get us back the liberties we once had. I do not pretend to know what that revolution will look like or even if it will be successful."

Asked about the new charges, Frein's lawyer, Michael Weinstein, said: "These are just allegations right now, these are not substantiated yet. Let's take a look at this evidence. We'll take this one step at a time. These type of cases take a long time and require careful scrutiny."

Frein also is charged with first-degree murder and other crimes for the September 12 ambush outside the state police barracks in Blooming Grove.

He's accused of killing Dickson and wounding Douglass before melting into the thick Pennsylvania woods.