An allegedly erratic Calif. woman, who previously attempted to abduct her two sons and flee to Taiwan, is being investigated for kidnapping the two boys, who are Bellevue residents, within the last week.

The Los Angeles Sheriff’s office is asking the public for help in locating 36-year-old Faye Ku and her sons Sage Cook and Isaac Cook. Her youngest son, Zephyr Ku, may also be with them.

The two boys, aged 14 and 9 respectively, are residents of Bellevue, where they reside with their biological father. The victims’ father has full custody of the children since their parents divorced in 2009.

The boys’ father made a public appeal for help on Thursday afternoon.

Sage Cook is reported to be 5′ 6″ and 109 lbs, while Isaac Cook is 4′ 6″ and 64 lbs. Both have brown hair and eyes. Photos of the suspect and her children can be viewed here.

Ku is alleged to have presented what appeared to be a “supervised visit” court order issued by the State of Washington to the missing children’s father. The Sheriff’s Department said in a press release that the father reasonably relied on what he thought was a legitimate order, and sent the children to California.

After she took custody of the children, the suspect left her home in Lakewood, Calif. with them. Ku also employed an unsuspecting witness to aid her.

They were last seen at the Los Angeles International Airport, upon their arrival on the afternoon of August 28, 2015.

The suspect allegedly intentionally left behind personal belongings at her place of residence that would prevent law enforcement from tracking her whereabouts, according to the Los Angeles Sheriff’s Department. In a prepared a letter, she blamed the children’s father for trying to control them, and asked him to leave them alone.

According to legal documents obtained from Washington, Ku attempted to leave the country with Sage and Isaac once before on June 12, 2013. They were detained by the local law enforcement agency before she boarded a flight to Taiwan, and she was arrested and charged with Custodial Interference.

Ku reportedly has several contacts in California, New Mexico, and Texas, as well as friends in Tijuana, Mexico. The Los Angeles detectives have been in contact with federal authorities, as well as several local agencies.

The Sheriff’s department is requesting that anyone who locates or has any information contact their local law enforcement agency, or Lakewood Sheriff’s Station, Detective Gabriela Hernandez, at (562) 623-3500.  Or if they wish to remain anonymous, they can call “LA Crime Stoppers” by dialing 800-222-TIPS (8477), or text the letters TIPLA plus your tip to CRIMES (274637,) or by using the website http://lacrimestoppers.org.

This post was update to include a photo of the two boys from Bellevue