Farm workers were badly injured after an immigration raid at a California marijuana farm, during which about 200 people – including 10 minors – were detained, according to a union.

“The UFW can confirm farm workers were critically injured yesterday during chaotic raids in Ventura County, California. Others, including US citizens remain totally unaccounted for,” United Farm Workers said in a statement Friday night. The union reported one death among the workers at first, but then said the death was not confirmed.

Clashes erupted outside Glass House farm in Camarillo on Thursday as protesters confronted federal agents in an attempt to stop the raid. Tear gas was fired at protesters, and National Guard troops with guns and gas masks tried to keep demonstrators from accessing the indoor farm.

Federal officials said a protester fired what looked like a pistol at federal agents. It’s not clear where the juveniles are from, but Customs and Border Protection boss Rodney Scott said the youngest was aged 14.