Thousands of Twitter users on Friday were urging people to #BoycottSanFrancisco after a jury there decided Jose Ines Garcia Zarate, a five-time deported Mexican man charged with shooting and killing Kate Steinle, was not guilty.

The Boycott San Francisco hashtag began trending on Twitter Friday morning as people vowed not to travel there or buy goods or services produced in the city.

San Francisco is a sanctuary city, which means local law enforcement ignores federal laws that would otherwise mandate cooperation with U.S. Immigration and Customs Enforcement officers, on issues such as telling federal authorities when illegal immigrants are being held.

The city's sanctuary policy came under scrutiny during the trial because it allowed Zarate to be released from jail without federal agents learning of his release, which left them unable to detain him so he could be deported for a sixth time for illegally entering the U.S.

Others chose to troll people who proposed boycotting San Francisco.