D.C. police say they have a new lead in the case of the violent beating that left a Capitol Hill husband and father in a coma.

Detectives have obtained surveillance video of a vehicle that might have been used by the suspects shortly after the early morning attack on Aug. 18, and they are asking the public to see whether they can identify the occupants or the car.

"Hopefully, someone will recognize the vehicle or the individuals in the video and be able to provide us with information," said D.C. police spokesman Officer Paul Metcalf.

Thomas Maslin, 29, was beaten and robbed on the 700 block of North Carolina Avenue SE after stopping at the Tune Inn bar on his way home from a Washington Nationals baseball game. Police found Maslin on the front porch of a house, about six blocks from his residence near Eastern Market.

Shortly after the attack, police said, the suspects may have tried to use the victim's credit card at an Exxon station on the 1200 block of Pennsylvania Avenue SE. Video from the gas station shows a man getting out of a silver four-door sedan with a sunroof. There are a least two other occupants in the car.

Anyone who can identify these individuals or who has knowledge of this incident is asked to call police at 202-727-9099 or send a text message to 50411. D.C. police are offering a reward of $1,000 in the case.

The attack on Maslin illustrates the rise in violent crime in D.C. as new money pours into neighborhoods scared by crime, neglect and poverty.

The Capitol Hill neighborhood where the attack occurred has seen a 56 percent increase in violent crimes in 2012, compared with 2011. Violent crime across the city has jumped 9 percent this year. Gun robberies are up 23 percent.