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By Andrew Blankstein

The gun used in the fatal shooting of a woman on a San Francisco pier belonged to an agent with the Bureau of Land Management, a Department of Interior agency, according to multiple law enforcement sources familiar with the investigation.

Sources could not immediately confirm how Juan Francisco Lopez-Sanchez, the undocumented immigrant charged in the killing, obtained the weapon. It was described as a large-caliber handgun.

The unidentified federal agent's weapon was stolen after being left in a vehicle, the sources said. It was not immediately clear when the gun was taken.

This undated photo released by the San Francisco Police Department shows Francisco Sanchez. A young woman was shot to death, apparently at random, while walking with her father and a friend along a popular pedestrian pier on Wednesday, July 1, 2015, at Pier 14 in San Francisco and died at a hospital. Police arrested Sanchez about an hour after the shooting. (San Francisco Police Department via AP)San Francisco Police Department via AP

The sources told NBC News the firearm did not appear to be government-issued. They stressed the information was preliminary and the investigation was ongoing.

Sanchez is being held on $5 million bail. Prosecutors had argued for $10 million.

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