SAN FRANCISCO — The original charges were shocking: Six San Francisco police officers were accused of stealing from drug dealers. Then federal prosecutors released racist and homophobic text messages.

Those texts have now turned a small-time police corruption case into a racially charged scandal, thrusting a diverse and liberal city into the national debate over policing in minority communities.

“We now know this can happen in San Francisco,” San Francisco District Attorney George Gascon said. “We’re certainly not immune to the problems that we have seen in Baltimore, Staten Island, South Carolina.”

The San Francisco turmoil comes amid growing tensions between police departments and communities of color. Large, sometimes violent protests over police treatment of black suspects have occurred in several cities over the last two years.

That has put police under a microscope. Three Fort Lauderdale, Fla., police officers were fired last month and a fourth resigned after they were found to have exchanged racist messages about colleagues and the predominantly black neighborhood they patrolled.

In San Francisco, Police Chief Greg Suhr has moved to fire eight officers, two of whom have since retired. Six others also are facing some kind of discipline.

The district attorney, meanwhile, is looking into whether the department’s racial problems run deeper than the officers implicated.

“In the process of looking at the text messages, increasingly I became uneasy that this may not be localized to the 14 officers that were being reported, but that we may have some systemic issues,” Gascon said.

San Francisco Police spokesman Albie Esparza says the department supports the district attorney’s examination, but disputes any suggestion that the police force of 2,100 sworn officers may suffer from systemic racism.