To say this is alarming is an understatement! While the FBI continues to investigate these men, they have been let go.

The FBI on Tuesday continued to investigate an incident in which 17 men were detained for reportedly firing off hundreds of rounds in a remote part of Apple Valley.

San Bernardino County Sheriff’s deputies and an FBI agent responded to the scene Sunday morning and detained the men – reportedly all of Middle Eastern descent – who were camping out in the Deep Creek Hot Springs area Sunday morning, authorities said.

A 911 caller reported hearing over 100 shots fired and seeing five to seven men wearing turbans and shooting “assault rifles, handguns, and shotguns,” according to a Sheriff’s Department statement.

A county sheriff’s helicopter located the men walking near a creek with backpacks “and other items”, The Los Angeles Times reported.

Officials say the men were cooperative as they were detained and searched.

Several handguns, a rifle, and a shotgun were found at the scene, but a records check found all the weapons were registered with the exception of the rifle, which reportedly didn’t have a serial number because it was purchased in parts, an FBI spokesperson told The Times.

Police scanner traffic posted online by the Victor Valley News Group described “a large group of subjects wearing turbans and chanting” at the scene.

“They were up all night chanting ‘Allah akbar’-type stuff,” an unidentified officer is heard saying on the audio recording.

Read more: CBS