The Long Beach Police Department reported a U.S. Immigration and Customs Enforcement (ICE) agent shot two other ICE agents at the Glenn M. Anderson Federal Building.
Long Beach police official said the shooter killed one person, wounded another with a shot to the stomach, and then was killed. It was not immediately clear if the shooter died from a self-inflicted wound.
Police were reportedly performing a security sweep of the building.
ICE released a statement:
"At approximately 5:30 (Pacific) this afternoon, two agents with U.S. Immigration and Customs Enforcement's (ICE) Homeland Security Investigations (HSI) were shot inside the agency's offices at the federal building in Long Beach. One of the agents died at the scene. The second agent was transported to a local hospital where he is listed in stable condition. The names of the agents are not being released pending notification of the next of kin. The shooting is being investigated by ICE's Office of Professional Responsibility, the Long Beach Police Department and the FBI."
An ICE agent later confirmed three agents were involved in the incident, and that the initial agent shooter is dead. The second agent was injured with multiple gunshot wounds. The third was unharmed.
KABC-TV LOS ANGELES, CA & The Associated Press contributed to this report.