The mayor of Oakland, Calif., is firing back at Donald Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE after the presumptive GOP presidential nominee called her city one of the most dangerous places in the world.

"Let me be clear, regarding @nytimes story, the most dangerous place in America is Donald Trump's mouth," Mayor Libby Schaaf tweeted on Wednesday.

Let me be clear, regarding @nytimes story, the most dangerous place in America is Donald Trump's mouth. — Libby Schaaf (@LibbySchaaf) May 18, 2016

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In a New York Times Magazine interview published Wednesday, Trump was asked about the most dangerous place he's visited. Initially, he jokingly responded, saying "Brooklyn."

“No, there are places in America that are among the most dangerous in the world. You go to places like Oakland. Or Ferguson," Trump said.

"The crime numbers are worse. Seriously."

In 2009, Oscar Grant was fatally shot by a transit police officer in Oakland.

In 2014, a local police officer in Ferguson, Mo., shot and killed 18-year-old Michael Brown, an incident that sparked civil unrest in the city.