Authorities executed another search warrant late Tuesday in the case of a former suburban Chicago police sergeant suspected in his 23-year-old wife's disappearance.

The latest warrant dealt with items inside two vehicles already seized from Drew Peterson's home, said Charles Pelkie, a spokesman for the Will County state's attorney's office.

• Click here for photos of Stacy Peterson

• Click here for photos of Drew Peterson

Click here for more photos of the Stacy Peterson investigation

"It expands the scope of the initial search warrant regarding items in his vehicles," Pelkie said. He declined to elaborate, including what items police found or were searching for.

Drew Peterson's attorney, Joel Brodsky, did not immediately return messages on Tuesday night seeking comment.

Illinois State Police did not immediately return a message after business hours Tuesday from The Associated Press.

After 23-year-old Stacy Peterson, the officer's fourth wife, disappeared in late October, authorities named her 53-year-old husband a suspect in what they have said is a potential homicide.

Prosecutors also are reviewing the death of Peterson's third wife, Kathleen Savio, and have said the drowning, deemed accidental at the time, may have been a homicide staged to look that way.

Peterson has not been named a suspect in her death.

"With all the hoopla, it's hard to believe something won't happen," he told WFLD-TV on Tuesday night.

On Nov. 1, state police seized two vehicles at the home the Petersons shared with their children — a GMC Denali and a Pontiac Grand Prix.