Los Angeles city officials were preparing this to start mailing notices to medical marijuana dispensaries warning that they have until June 7 to shut down under the city's new pot shop law, according to the City Attorney's office.

The letters will start going out Tuesday to more than 400 marijuana retailers in the city that are alleged to be in violation of the law, which prohibits the outlets from being within 1,000 feet of schools, churches, parks and other “sensitive use” sites. The ordinance, signed Friday by Mayor Antonio Villaraigosa, would put all but 137 pot shops out of business.

If the shops don't comply, “we could pursue crim or civil charges,” City Attorney's spokesman Frank Meteljian told the Weekly.

“The letters inform the owners and operators the ordinance has been signed and it goes into effect next month,” he said, “and that it's our understanding you're not complying and have to shut down.”

A group of 21 shops have filed suit in an attempt to block the law from going into effect.

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