Boston Police have arrested three men in connection with a Saturday night shooting on the South Boston/Dorchester line that left a man dead.

The arrests came after police found a man suffering from gunshot wounds around 10:30 p.m. Saturday night in the area of 425 Old Colony Ave.,   according to a police report. The victim, who has not been identified, was later pronounced dead, police said.

The suspects, who have also not been identified, were seen in a car speeding away from the scene of the alleged shooting and appeared to be changing their clothes, according to police. Officers found the vehicle and arrested its three occupants about five miles away in the area of Elm Street, the report said.

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Police also seized a firearm, which they believe was the weapon used in the alleged attack, police said. Charges against the suspects have not been formally announced.

"I'm grateful that we were able to get those responsible for this senseless act,” Boston Police Commissioner William Evans said in a statement. “We have three suspects in custody at this time because of the outstanding work of my officers and their quick response."

The department seeks help from witnesses or those with tips about the crime, who can call homicide detectives at 617-343-4470 or the CrimeStoppers tip line at 1-800-494-TIPS or text the word “TIP” to 27463.

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Police promise to “stringently guard and protect the identities” of tipsters who wish to remain anonymous, the release said.