07/30/2012 08:46 pm ET Updated Aug 01, 2012

Robert Johns, Golden Gate Park Homeless Man, Discovered With 5,000 Rounds of Ammunition

San Francisco police officers made a chilling discovery when they searched the car of a homeless man on Saturday.

Robert Johns was parked in Golden Gate Park when officers searched his vehicle and found a sawed off shotgun, a 9mm semiautomatic pistol, 14 knives and more than 5,000 rounds of ammunition.

"The totality of the circumstances ... suggests that Johns may be preparing to engage in some violent act of unknown dimension," Officer Elizabeth Prillinger, who wrote the report on the incident, told the San Francisco Chronicle.

Officers had already searched Johns' car earlier this month and confiscated a 12-gauge shotgun and a loaded .22 rifle. The officers assumed that they had removed the threat by confiscating those weapons.

Two weeks later, however, a Haight District yoga studio called police after members complained that Johns had harassed them, reported SF Weekly's The Snitch.

Johns was stopped for driving without a license days later. When he got out of his car, Officer Brett Bodisco spotted the shotgun.

Johns is currently in custody. Charges include illegal weapons, concealed weapons, and possession for sale.

UPDATE: Police revealed Wednesday that the suspect, Robert Johns, was also in possession of a list of high-profile politicians--including President Obama and Speaker of the House John Boehner.

Johns told KTVU that he had "no intention of shooting anyone. It's in no way related to the [Aurora] shootings and I had no intention of harm".

However, Police Chief Greg Suhr said at a press conference that Johns told officers he had plans to hurt a family member.