SACRAMENTO, Calif. (AP) — A man took a coconut cream pie from a grocery bag, grabbed Sacramento Mayor Kevin Johnson from behind and smacked him in the face with it at a charity event, leading the former NBA star to start swinging and then tackle the man who was left battered and facing assault charges.

FILE -In this June 23, 2014 file photo, Sacramento, Calif., Mayor Kevin Johnson, president of the U.S. Conference of Mayors, speaks before a panel discussion about sports and race relations during a conference meeting in Dallas. A man hit Mayor Johnson in the face with a pie at a charity dinner. The mayor's Chief of Staff Crystal Strait called the Wednesday night, Sept. 21, 2016, incident at the Sacramento Charter High School a shocking assault, but said the mayor wasn't hurt. (AP Photo/LM Otero, File)

FILE -In this June 23, 2014 file photo, Sacramento, Calif., Mayor Kevin Johnson, president of the U.S. Conference of Mayors, speaks before a panel discussion about sports and race relations during a conference meeting in Dallas. A man hit Mayor Johnson in the face with a pie at a charity dinner. The mayor’s Chief of Staff Crystal Strait called the Wednesday night, Sept. 21, 2016, incident at the Sacramento Charter High School a shocking assault, but said the mayor wasn’t hurt. (AP Photo/LM Otero, File)

The pie wielder and local activist, Sean Thompson, 32, said Thursday that the mayor overreacted, sending him to the hospital for nine stitches before he went to jail. He said he was angry Johnson devoted so much political energy to an arena for the city’s basketball team and not to other needs such as education and homelessness.

The mayor was greeting people eating at an outdoor charity dinner Wednesday night at Sacramento Charter High School when Thompson pulled Johnson back and shoved the pie in his face, said Johnson’s chief of staff, Crystal Strait.

“There was no throwing of the pie,” said Erika Bjork, who works for a professional soccer team in Sacramento and saw the encounter up close. “This was a direct assault. It just happened that he had a pie in his hand.”

Bjork, whose boss is a major donor to Johnson, said the mayor looked shocked and swung at Thompson multiple times, but she didn’t see him land any punches.

Sean Thompson, who allegedly struck Sacramento Mayor Kevin Johnson in the face with a pie, talks to The Associated Press during a jail interview Thursday, Sept. 22, 2016, in Sacramento, Calif. The mayor was attending a charity dinner Wednesday night when Thompson came up from behind and struck him with the pie. Johnson, a former NBA star responded and Thompson, a community activist, was quickly arrested by Sacramento Police. Thompson, 32, is expected to be arraigned on charges in Sacramento Superior Court, Friday. (AP Photo/Rich Pedroncelli)

Sean Thompson, who allegedly struck Sacramento Mayor Kevin Johnson in the face with a pie, talks to The Associated Press during a jail interview Thursday, Sept. 22, 2016, in Sacramento, Calif. The mayor was attending a charity dinner Wednesday night when Thompson came up from behind and struck him with the pie. Johnson, a former NBA star responded and Thompson, a community activist, was quickly arrested by Sacramento Police. Thompson, 32, is expected to be arraigned on charges in Sacramento Superior Court, Friday. (AP Photo/Rich Pedroncelli)

Thompson had red and blue bruises around his right eye when he spoke to The Associated Press in jail.

“When I threw the pie at him, right at that moment, I shouted at him. I said, ‘You need to better represent me,’” Thompson said.

He said the mayor turned and hit him at least twice “and pretty hard.” Thompson said he covered his face and started to move away but was quickly surrounded by people and kept taking hits. He couldn’t tell who delivered the blows.

Thompson said he expected to be tackled by police but was caught off guard when the punches came from the mayor. He said he has no regrets but was surprised to be facing a felony, assaulting a public official.

He was held on $100,000 bail and was expected to be formally charged Friday.

Johnson’s signature achievement in office was getting a $550 million arena built for the Sacramento Kings, which Thompson said took attention away from other issues.

Cres Vellucci, who organizes legal support for activists at the National Lawyers Guild in Sacramento, said people in the social justice community are concerned about Thompson’s safety and Johnson’s physical response.

Prosecutors will review the case, including the mayor’s reaction, after receiving the police reports, likely on Friday, district attorney spokeswoman Shelly Orio said.

Vellucci wrote in an email that he met Thompson five years ago and described him as a nonviolent person who participated in some of the first Black Lives Matter protests in Sacramento in 2014 and in Occupy Sacramento rallies before that.

Police and Johnson’s chief of staff said Thompson was not previously known to the mayor and his staff. In an interview with local TV stations, Thompson said he’s interacted with Johnson many times during city meetings for activists and that the mayor often appears disinterested and unengaged in community members’ concerns.

Johnson is well-known for his efforts to revitalize Oak Park, a predominantly African-American neighborhood.

He’s a graduate of the high school where the event was held Wednesday and brought it back from the brink of dissolution in the early 2000s by incorporating it in a system of charter schools he founded to help disadvantaged communities.

Johnson, who had a long career as an NBA All-Star with the Phoenix Suns and a brief stint with the Cleveland Cavaliers, has about two months left as mayor. He decided not to seek a third term.

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Associated Press writer Jonathan J. Cooper contributed to this report.

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This story has been corrected to correctly spell the name of Cres Vellucci.