MILTON — A midday shooting in Roxbury on Wednesday left one man in serious condition and triggered a lengthy ­police chase through the streets of Boston that ended in Milton shortly after the suspect crashed his vehicle into a dump truck.

Boston police say a man was shot in the stomach at 122 ­DeWitt ­Drive, just off Madison Park, at 12:23 p.m. The victim was transported to Boston Medical Center.

Commissioner Edward F. Davis said it’s “too early to tell” what motivated the shooting, but he said the crime was caught on camera by surveillance video at the Madison Park Village housing complex. Davis said police believe there may have been two people ­involved in the shooting.

A short time after the shooting, a female officer who heard a description of the suspect’s car saw the vehicle and tried to stop it. The car fled and the chase ensued, winding through several busy streets in Dorchester and Neponset and ultimately ending at the intersection of Randolph Avenue and Reedsdale Road in Milton, when the suspect tried to make a high-speed turn onto Route 28 South.

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Witnesses said the vehicle crossed into oncoming lanes and became stuck when trying to squeeze between a dump truck and the curb in front of a Tedeschi Food Shops store. ­Carmen Zanghi, 42, of Canton, who was driving the dump truck, said he used his truck to pin the suspect’s vehicle until police could arrive.

“I thought he was just an ­idiot kid and he was going to take off,” said Zanghi, who was on his way to deliver a load of mulch for his employer, ­Lambert’s Garden Center of Westwood, when he said the vehicle slammed into him traveling between 40 and 50 miles per hour. “But when I saw his eyes, I knew. You could just tell he was scared to death. His eyes were just wide white.”

Zanghi said the suspect tried to gun the car out of the jam, but as police approached he opened the door and fled on foot, running behind the convenience store and into the backyards of houses on Reedsdale Road. That’s where witnesses say he was apprehended by ­police.

As the afternoon wore on, dozens of police and detectives combed the woods behind the homes, looking for clues. Joe McCarthy of Brockton, who was just pulling into the ­Tedeschi parking lot when the crash happened, said he saw the suspect carrying something white in his hand when he fled, but did not see any weapon.

Police declined to release the names of the victim or the suspect.

Zanghi and other witnesses described the suspect as a black male in his early 20s.

In Roxbury, neighbors said the victim — who was also in his early 20s, according to neighbors — managed to walk across the street to the Madison Park Village management ­office, where he asked for help. Jose Fernandes said the victim was able to walk and did not appear to be bleeding heavily.