London Breed: 'We will not tolerate anyone coming to San Francisco for 420 this year'

A man blows smoke after taking a hit from a bong during a 4/20 celebration on Hippie Hill in Golden Gate Park on April 20, 2018 in San Francisco, the first year of legal recreational consumption. A man blows smoke after taking a hit from a bong during a 4/20 celebration on Hippie Hill in Golden Gate Park on April 20, 2018 in San Francisco, the first year of legal recreational consumption. Photo: Justin Sullivan/Getty Images Photo: Justin Sullivan/Getty Images Image 1 of / 49 Caption Close London Breed: 'We will not tolerate anyone coming to San Francisco for 420 this year' 1 / 49 Back to Gallery

San Francisco Mayor London Breed delivered a stern message at a Monday press conference about the annual April 20 cannabis celebration known as 4/20 on Hippie Hill in Golden Gate Park.

"We will not tolerate anyone coming to San Francisco for 4/20 this year," Breed said. "Police officers will be patrolling the area. We will cite people and if necessary arrest them."

The Robin Williams Meadows where people usually gather to smoke on 4/20 will be fenced off and roads will be blocked to hamper access to the area, she said.

The organizers of the festival announced the event's cancellation last week and Breed asked people to not identify a different location for an unofficial event. She recognized that in years past some laws such as no smoking in parks haven't been enforced, but this year law enforcement will be vigilant about the shelter-in-place order.

"We will be very strict with our policies," she said. "We will not allow it. We will be prepared if people start to show up to make sure it doesn’t happen."

MORE CORONAVIRUS COVERAGE:

Sign up for 'The Daily' newsletter for the latest on coronavirus here.

Amy Graff is a digital editor with SFGATE. Email her: agraff@sfgate.com.