Two New Jersey brothers and their puppy were killed when their car fell 30 feet off an overpass while they were street racing — with their two 18-year-old brothers also left fighting for their lives, police said.

Aaron Davis, 23, and Joshua Davis, 22, were not wearing seatbelts when they were thrown from the back seats of a 2006 Mazda that crashed into a guardrail while racing a Dodge Challenger in Philadelphia late Friday, Pennsylvania State Police said Monday.

A puppy in the back with them was also thrown from the car and found dead after it crashed around 30 feet from an overpass on the I-95, police said.

Two other Davis brothers — Benjamin and Nathaniel, both 18 — were taken to the hospital with severe injuries, cops said. They remain in critical condition, 6ABC reported.

It was not immediately clear which brother was driving when it crashed and plunged off the overpass onto the street below.

Footage captured by 6ABC showed the totaled car with shattered windows flipped onto its side.

Street racing might have contributed to the crash, cops said.

Aaron Davis is identified as a resident of Canterbury, New Jersey, while the rest of the brothers are residents of East Windsor, according to cops.