SAN DIEGO – Police were seeking to question a man in connection with the killings of two homeless men and the stabbing of a third over the Fourth of July weekend.

Authorities released convenience store surveillance video of the man — identified as a person of interest — wearing a baseball cap, jacket and a backpack. They describe him as 30 to 50 years old.

“When you look at all three cases, looking at the scene, talking to people, this person is definitely someone we want to talk to,” said San Diego police Capt. Dave Nisleit, who declined to comment on possible motives for the attacks.

Police said Tuesday that one victim suffered extensive trauma to his upper torso and died before his body was set on fire. He was identified as Angelo De Nardo, 53, who had family in Pennsylvania. His badly burned body was found Sunday morning between Interstate 5 and some train tracks.

The person of interest was seen running from the fire.

On Monday, police responded to a 911 call of a second man who suffered life-threatening injuries to his upper torso. Nisleit said Tuesday that doctors expected him to survive.

A few hours later, police discovered the second dead body, that of a man who bled from the upper torso.

Nisleit said De Nardo was the only body set on fire.