San Francisco's former fire commissioner was brutally attacked this week after a "group of homeless people" slashed him with a knife and fractured his skull with a pipe in his own front yard, according to a family friend.

The attack on Don Carmignani happened just outside his home in the city's Marina District, his friend and prominent Bay Area lawyer Joe Alioto Veronese revealed on Twitter.

"Last night at 7pm in the marina district at Laguna and Chestnut Street, a friend and former San Francisco Commissioner was brutally beaten by a group of homeless people in front of his home," he tweeted. "He is at SF general fighting for his life. Pray4Him."

Alioto Veronese told Fox News Digital he was headed to the hospital Friday morning to visit Carmignani, who is expected to survive the attack.

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San Francisco Supervisor Catherine Stefani, who represents the neighborhood where the attack took place, reportedly said during a city meeting after the attack that a shortage of personnel in the city's police department may have led to the incident.

She said Carmignani's mother had previously called police on a group of homeless drug users outside her front door, according to The San Francisco Standard. But no one arrived, so he went out to shoo them away.

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"I’ve been here 21 years, and this didn’t use to happen," she was quoted as saying. "I believe this is a direct result of the fact that we do not have enough officers on our street."

San Francisco Police did not immediately respond to an inquiry from Fox News Digital, but FOX 2 San Francisco reported earlier that a 24-year-old suspect named Garret Doty had been arrested nearby.

The attack comes just days after Cash App founder Bob Lee, a 43-year-old father of two, died in a stabbing in the city's affluent Rincon Hill neighborhood.

"They try and pretend San Francisco is safe, but it is not," said Jake Shields, a mixed-martial arts fighter and friend of Lee's who has been critical of violence in the city and its Democratic leadership.

Shields said he became fast friends with Lee years ago after they met at a music festival and didn't realize how prominent the tech titan was until after his death. Both men wound up moving out of San Francisco in recent years.

When Lee left in October, Shields said, it was partly because of threats to public safety in the city and partly because he had become enamored with his new home in Miami.

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"He liked the energy more in Miami," Shields said. "He thought the energy had kind of died out in San Francisco, but crime itself was a big part of it."

In January, tweeting about preparations for a mundane work meeting, Lee noted that "Miami feels like Silicon Valley in the early 2000s."

"Maybe the one positive in this is really a lot of talk and pressure on San Francisco to change," Shields told Fox News Digital Friday.

The attack on Carmignani happened not far from House Speaker Nancy Pelosi's home, which was targeted in a home invasion attack last year that left the congresswoman's husband with a fractured skull.

City crime statistics show that most major crimes have fallen so far in 2023, compared to the same period last year. 

However, violent crime has risen slightly, driven by an 18% increase in robberies and a 33% rise in homicides.

Felony assaults have remained flat, and misdemeanor assaults have climbed by 13%, according to the statistics.

Anyone with information on Lee's death is asked to call San Francisco's tip line at 1-415-575-4444.