Chaos erupted outside the Los Angeles County Courthouse Monday as a bomb threat was called in — amid the charges issued against accused killer D4vd in the high-profile Celeste Rivas case.

Law enforcement tells us they received a verbal threat, and the bomb squad is on the way to the courthouse. We hear the threat doesn’t seem credible … but they’re taking no chances. The call came in during heightened security surrounding D4vd’s arraignment … forcing an immediate response from police and courthouse officials.

Parts of the building were evacuated, and the media were told to exit as a precaution while authorities worked to determine whether the threat was credible.

As you know, the rising music star — real name David Burke — was officially charged Monday with the murder of a 14-year-old girl whose body was discovered in his car months after she vanished. The case has already drawn massive attention … and today’s scare only added fuel to an already explosive situation.

It’s unclear at this point if the threat was directly tied to the case or just terrible timing … but either way, it sent nerves through the roof as media, court staff, and onlookers flooded the scene.