Sgt. Jason Hicks says people up and down the Interstate 5 corridor have reported seeing the blue Nissan Versa being sought by authorities. Some reports have come in from the Vancouver, Wash., area and others from the Tacoma area.
There was also an unconfirmed sighting on the Olympic Peninsula, in which the caller reported seeing a blue Nissan hatchback with a man driving and a female passenger in the back. The caller said the car appeared to have California plates.
Troopers have been responding to each report but haven't located the car.
Hicks also says State Patrol personnel at Washington's ferry terminals are keeping an eye out, and that once the Patrol received information about the Amber Alert from California authorities, it forwarded the information to Canadian officials, the U.S. Border Patrol and Idaho police.
The Amber Alert was expanded to Oregon, Washington and Nevada as authorities search for James Lee DiMaggio, 40, who is believed to have kidnapped 16-year-old Hannah Anderson. DiMaggio is believed to be driving a dark blue 2013 Nissan Versa with California plate 6WCU986.
Anyone who sees DiMaggio or the car is asked to call 911.
Evidence found in the rubble of the home suggested that DiMaggio may have fled with explosives, said San Diego County Sheriff's Capt. Duncan Fraser, declining to elaborate on what was discovered. Investigators worried that DiMaggio might abandon his blue Nissan Versa after rigging it to explode.
"In the event that someone comes across the car, they need to use caution," Fraser said.
DiMaggio is also a suspect in the death of Christina Anderson, Hannah's mother, and the possible death or abduction of her 8-year old son Ethan.
On Sunday night, authorities found the body of Christina Anderson near a dead dog when they extinguished flames at DiMaggio's rural home. A child's body was found later as they sifted through rubble in Boulevard, a remote hamlet 65 miles east of San Diego on the U.S.-Mexico border.
San Diego County Sheriff's Capt. Duncan Fraser said Thursday that evidence recovered at James Lee DiMaggio's home east of San Diego suggests he might have fled with homemade explosives.
Fraser says it's possible DiMaggio was infatuated with the girl and her grandfather said Wednesday it appeared DiMaggio had carefully planned the abduction.
Also Wednesday, a friend of Hannah Anderson said DiMaggio told Hannah he had a crush on her and would date her if they were the same age.
"She was a little creeped out by it. She didn't want to be alone with him," said the friend, Marissa Chavez.