Prosecutors: Man With Weapons Trove Made Threats Against Homeland Security Officers, Mosque, President Obama

Joseph Garguilo allegedly had a huge weapons cache in his residence, including more than 120 rounds of ammunition for an AR-15 rifle

A Massachusetts man is facing federal charges for allegedly stockpiling weapons, threatening to kill President Barack Obama and numerous police officers and to attack a mosque.

Joseph Garguilo, 48, is charged with being a prohibited person in possession of ammunition. He was scheduled to appear in federal court in Boston at 2:30 p.m. on Monday; it wasn't immediately clear if he has an attorney.

According to the criminal complaint, the FBI received information on July 27 that Garguilo had recently acquired parts to make an AR-15 rifle and was stockpiling other weapons, including Tasers, mace guns, hunting knives and chemicals to make thermite grenades.

Around the same time, he allegedly stated that "he will plant a bomb in police stations ... and kill as many homeland security officers as he can before they kill him." 

The FBI started an investigation, and in recent days learned that Garguilo had stated that he wanted to attack a mosque. He also allegedly said he wanted to "chain a mosque closed and burn it down." He did not mention any specific mosque.

He also allegedly made a threat against Obama's life, saying that when the president was on the golf course in Martha's Vineyard on his recent vacation, he should have taken the opportunity to kill him.

Garguilo was stockpiling food and water as part of his plan, and an acquaintance said they believed that Garguilo was "about to snap."

Federal agents searched Garguilo's residence on Friday and seized parts to assemble an AR-15 rifle, more than 120 rounds of ammunition for an AR-15 rifle, more than 30 rounds of 9mm ammunition, chemicals that could be combined to create explosive compounds and handwritten notes threatening violent attacks against members of the Islamic faith.

Garguilo was already the subject of an active restraining order prohibiting him from possessing firearms and ammunition. He also does not have a license to carry a firearm in Massachusetts.

Holliston police told federal investigators that they were familiar with Garguilo and he had metal bars on his doors and windows and wears a handcuff key on his neck.

Neighbors said they had no idea what was going on inside the home.

"I just always thought something was a little off," said neighbor David Hines.

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