Investigators hunting the sniper blamed for 10 killings in the Washington area have identified two men they want to talk to.
Television networks quoted police sources as naming the men as Mr John Allen Williams, also known as Mohammed Williams, and Mr John Lee Malvo.
One of them may have served in the US Army, federal government officials said.
CNN and Fox News Channel reported that police were looking for a 1990 Chevrolet Caprice automobile with a New Jersey registration number.
On the other side of the country - in Washington State, FBI agents searched a property in Tacoma with metal detectors in an operation local media said was related to the search for the sniper, who first struck on October 2nd.
FBI agents also searched for two unnamed people in another Washington state city, Bellingham, on Wednesday, city mayor Mr Mark Asmundson said. He said one of them was a foreign national.
On Wednesday, police confirmed a bus driver shot and killed on Tuesday in the Montgomery County district of Aspen Hill was the latest victim of the sniper.
The federal government officials declined to say if the two people being sought were suspects in the investigation. They said the person who may have served in the Army had been stationed at Fort Lewis, in Washington state near Tacoma.
The television networks said John Allen Williams had been stationed at Fort Lewis.