Amber Alert in Oregon and Washington for kids abducted in Calif.

An Amber Alert has been issued in Oregon and Washington for a 16-year-old girl and her 8-year-old brother who may be with a man suspected of a homicide in Southern California.

The Amber Alert was issued in Washington and Oregon on Wednesday afternoon, police say. A previous Amber Alert had been issued in California earlier in the week.

The suspect, James L. DiMaggio, 40, is driving a blue 2013 Nissan Versa and was possibly seen in Southern Oregon near Lakeview.

The California license plate number is 6WCU986.

Hannah Anderson and her brother, Ethan, were last seen Aug. 3.

The Amber Alert states that DiMaggio is believed to be traveling to Texas or Canada and abducted the kids from Boulevard, Calif.

Anyone who sees this vehicle in Oregon should call 911 or the Oregon State Police at 1-866-5AMBER5.

DiMaggio is wanted in the death of the girl's mother, and investigators have uncovered sordid details of the man's affection for her daughter. A friend of Hannah told the Associated Press he had a crush on Hannah and would date her if they were the same age.

Marissa Chavez, 15, said DiMaggio explained that he didn't want the girls to think he was weird in an effort to defend himself after noticing they exchanged glances. She said he spoke while driving them home from a high school gymnastics meet a couple months ago.

Hannah Anderson asked Chavez to join her from then on whenever DiMaggio, 40, drove her to meets.

"She was a little creeped out by it. She didn't want to be alone with him," Chavez said.

DiMaggio was like an uncle to Hannah and 8-year-old Ethan. He was very close with their parents for years.

On Sunday night, authorities found the body of 42-year-old Christina Anderson when they extinguished flames at DiMaggio's rural home. A child's body was found as they sifted through rubble in Boulevard, a tiny town 65 miles east of San Diego on the U.S.-Mexico border.

The child's body has not been identified but it may be Ethan, sheriff's Lt. Glenn Giannantonio said late Tuesday.

Christina Anderson's father, Christopher Saincome, said Wednesday that his daughter visited DiMaggio's home last weekend to say goodbye before he moved to Texas. DiMaggio, who works as a telecommunications technician at The Scripps Research Institute in San Diego, was a regular presence at the Anderson family apartment in Lakeside, a suburb of 54,000 people.

"He must have had this planned," Saincome said.

Saincome said nothing seemed amiss when he called his daughter at work Friday to let her know she didn't call on his birthday. Anderson, a medical assistant, said she would call back that night but never did.

Chavez, who spoke at a candlelight vigil for Hannah on Tuesday night, said DiMaggio argued with her friend when he took her to Hollywood in late June or early July for her birthday. DiMaggio was upset that Hannah was "paying more attention to posting pictures (on her phone) than talking to him."

"He got upset and ended the trip early," Chavez said.

Brett Anderson, who flew from Tennessee to San Diego on Tuesday, pleaded with DiMaggio to release his daughter, saying, "You've taken everything else."

"Jim, I can't fathom what you were thinking. The damage is done," he said outside San Diego County Sheriff's Department headquarters after being interviewed by investigators Tuesday.

DiMaggio is wanted on suspicion of murder and arson in a search that began in Southern California and spread to Mexico and neighboring states.