Federal prosecutors are cracking down on medical marijuana shops in Los Angeles.
The government has targeted more than 375 businesses in the city's commercial marijuana industry. Federal law does not recognize a state initiative that legalized pot for medical use.
Many marijuana shops are bringing in huge amounts of money and serving as fronts for drug traffickers.
One so-called medical marijuana collective in Chinatown was shut down after the Drug Enforcement Administration served a search warrant. Agents say it was the largest operation in downtown Los Angeles.
"They seized their marijuana, cash and in at least one case guns from inside of the store," U.S. Attorney's Office spokesman Thom Mrozek said.
Supporters argue the shops are protected by California law. But while the state allows medical marijuana, the city of Los Angeles has been trying to limit the booming growth of pot clinics.
Their restrictions are being challenged and could be overturned by voters if a referendum is placed on an upcoming ballot.