A Baltimore man survived being shot by an unknown assailant early yesterday morning while driving to his job at the seafood market in Jessup, Howard County police said.

Daniel Martin, 29, was getting off Interstate 95 heading onto eastbound Route 175 about 3:15 a.m. when a bullet pierced the rear window of his cargo van and struck him in the back, police spokeswoman Sherry Llewellyn said.

Martin was treated at the Maryland Shock Trauma Center in Baltimore and was released yesterday, a hospital spokeswoman said. A male co-worker, whose name police did not release, was in the van but was not injured.

Llewellyn said Martin normally arrives at work at 3:30 a.m. A few vehicles were on the road during the shooting, and police suspect that someone in a vehicle behind Martin's van pulled the trigger. The bullet likely came from a handgun, she said.

A police helicopter searched the area shortly after the shooting but found nothing suspicious, she said. The motive for the shooting remained unknown.

"Why that shot was fired, we just don't know," Llewellyn said.

She said that Martin has no criminal record and that road rage did not seem to be a factor. Police are asking anyone with information to contact them at 410-313-3200.

Daniel Martin, 29, of Baltimore was leaving Interstate 95 for Route 175 when a bullet pierced his van from behind and struck him.