A 26-year-old man was killed in a drive-by shooting on a Brooklyn street early Monday, authorities said. 

The victim was struck in the chest on Dinsmore Place near Chestnut Street in Cypress Hills when a gunman opened fire from a blue SUV around 2:15 a.m., cops said.

Police were responding to a call about the gunfire when they found the gravely victim around the corner on Richmond Street, the NYPD said. 

The man, whose name has not been released pending family notification, was rushed to Jamaica Hospital Medical Center, where he died. 

The motive for the deadly violence was unclear. No arrests have been made.

In a separate incident around 9:50 p.m. Sunday, two men – 42 and 44 – were sitting inside a Toyota Camry at Bay Ridge and Ninth avenues in Dyker Heights, Brooklyn when a stranger entered the back seat, flashed a gun and told them to drive, cops said. 

The car stopped on Bay Ridge Avenue near 10th Avenue, where the gunman got into a physical fight with the two victims, police said. 

A single round was fired during the struggle, but no one was hurt. 

The victims got away from the suspect, who took off in the Toyota, police said. They refused medical attention at the scene. 

No arrests have been made.