Doctor pleads not guilty to charges of stockpiling bomb chemicals

A New Jersey medical doctor accused of stockpiling weapons and chemicals for making bombs pleaded not guilty to charges during a hearing on Tuesday.

Roberto Rivera appeared in Bergen County Central Municipal Court on Tuesday. He is charged with posing a public threat by storing a stun gun, several assault weapons and a large amount of a highly volatile chemical used commonly for bomb making, Ridgewood Patch reports.

Rivera said that he understood the charges and had not determined who would represent him legally. Judge Jae Y. Kim entered a plea of not guilty on Rivera's behalf and suggested Rivera consult with a public defender.

On Friday night, FBI officials allegedly found chemicals at Rivera's home in Ridgewood during a search, but few details were released about the type and quantity of chemicals found in the alleged cache.

Rivera has a valid license to practice medicine in New York and was not charged with any particular plot in connection to the alleged discovery of the weapons cache.

Rivera was fired from his job at St. Vincent's Hospital in Manhattan in 2006 after he was accused of stalking a colleague.

Rivera was active in the Occupy Wall Street movement and is believed to be a survivalist, occasionally erecting tents in the backyard of his Ridgewood home at odd hours.

Shannon Mulligan, Rivera's roommate, said that Rivera was self-diagnosed with Asperger's Syndrome and that he is an anti-violence loner who wouldn't hurt a fly, Ridgewood Patch reports.