The son of former Ontario MPP and Hamilton city councillor Brad Clark is in serious condition after a shooting in the city's east end that left the gunman dead.

Brandon Clark, 26, was one of two men injured when, according to police, a man showed up with a shotgun during a gathering at a Queenston Road apartment at about 2 a.m. Sunday and opened fire.

Three people were sent to hospital according to police and paramedics — two men, aged 26 and 34, with bullet wounds and a 26-year-old woman who injured herself while jumping off the third-floor balcony with another man.

Both men are in serious condition at Hamilton General Hospital.

"The gunman also sustained a gunshot wound and was pronounced dead at the scene," said homicide detective Paul Hamilton.

Police did not say if someone had returned fire or if the gunman's fatal wound was self-inflicted.

They are not, however, seeking any suspects.

Asking for prayers

Brad Clark posted a message on his Facebook page asking for prayers and, according to one source who spoke to CBC News on condition of anonymity, a note was sent to city councillors and senior staff notifying them of his connection to the shooting.

"Please pray for our son, Brandon … who met with tragedy early this morning. This is very serious, please pray for their full recovery," Clark wrote. "God bless."

Brandon Clark is believed to have been shot in the back, according to a second source who is close to the family and who also spoke on condition of anonymity.

The source the resident of the apartment opened the door to the gunman at around 2 a.m.

"He took a shotgun blast point blank," the source said. "Brandon was right behind him and turned to run away and he took a blast to the lower back."

Hamilton Ward 10 councillor Maria Pearson said she was shocked to hear the news Sunday, and hopes Brandon will have a full recovery.

"My god, my prayers go out to the whole family and Brandon especially," Pearson said.

Police on the scene

Police say a man showed up with a shotgun during a gathering at a Queenston Road apartment at about 2 a.m. on Sunday and opened fire. (David Ritchie/CBC)

More than five police cruisers remained outside the building on Sunday afternoon, with an officer stationed outside the third-floor apartment, and another just inside the main entrance, in front of a smear of blood on the wall next to the building's stairs.

Resident Edye Carpenter heard the events unfold from her apartment down the hall.

"I don't know who phoned 911, I was going to, but I was afraid to go to the door," said Carpenter.

"I heard a guy say, 'I'm going to bash your head in the wall.' After that it kind of quieted, and then it escalated again."

"And then I heard 'pop pop' and a woman scream twice."

Brad Clark was a Conservative MPP for Stoney Creek from 1999 to 2003 and served as Ontario's minister of labour and minister of transportation for the province. He left city council for an unsuccessful bid for the mayor's seat in 2014.