Officials are investigating in downtown Atlanta after reports that a man claiming to have red mercury from Africa walked into the Region 2 location of the U.S. Nuclear Regulatory Commission, police said.

“We received a call regarding a male coming into the facility carrying red mercury from Africa,” Atlanta police Officer Stephanie Brown said. “We are still gathering details on the call.”

Red mercury is reportedly a substance used to create nuclear bombs, but its existence has not been documented.

Brown said Homeland Security is en route to the location.

Parts of Peachtree Street, Peachtree Center Avenue and Courtland Street have been closed and officers are redirecting traffic.

A hazmat team, bomb squad and fire trucks were seen near the investigation.

No other details were released.

— Please return to AJC.com for updates.

In other news:

Sergeant Sam Worsham said it started after the victim honked at the gunman for not driving when the light turned green.

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