US Marshals in Portland have confirmed a sighting of Dirck White in Iowa.

A motorist called 911 April 5th, after an encounter with White on Interstate 80, just East of Des Moines. Supervisory Deputy Eric Wahlstrom says the motorist reported seeing another driver fire a gun through the window of his car. "The gun was not fired at the caller, it was something that was observed at a distance," said Wahlstrom. No one was hurt.

The Iowa State Patrol linked the make, model and Washington license plate to the Mercedes that White was last seen driving. Law enforcment still doesn't know where White is, but this sighting gives them a better idea.

White was driving an O'Malley Brothers truck loaded with firewood on February 6th, when 47-year-old Clackamas County Weighmaster Grady Waxenfelter stopped the truck on Highway 224, South of Damascus, because it didn't have a license plate. Wahlstrom says it's possible that White, a career criminal with arrest warrants out, thought Waxenfelter was a police officer, and shot him to death.

White is also wanted on a firearms violation and for questioning in a child sex abuse case in Washington state.

The reward for information leading to White's arrest has grown to $16,000. Anyone with information should call 911, and tips can be submitted to 503-723-4949 or the Clackamas County Sheriff's online tip form.