CHICAGO (CBS) -- A 4-year-old Rock Island girl who was the subject of an Amber Alert earlier this month was never abducted, and was safe at home the entire time, police said.

Two girls were located on Thursday after they were believed to have been abducted by their father in Hanford, Kings County.

Just about 24 hours after an AMBER Alert was issued for a teen out of Missouri City, the teen was found, according to Texas Department of Public Safety officials. The teen was reportedly OK. Officials with the Missouri City Police Department said she walked into a Child Protection Services office in Rosenberg on Thursday.

Detectives located the suspect and the children by tracking signals from both his cellphone and his slain girlfriend’s, which had gone missing, Kings County Sheriff David Robinson told reporters at a news conference on Thursday.

The Amber Alert included Los Angeles, Orange, San Diego and Riverside counties, with authorities saying the suspect may have fled to Mexico.

A 4-year-old Rock Island girl who was reported missing after an apparent kidnapping during an auto theft, triggering a statewide Amber Alert, was never missing, police said at a press conference Thursday.

Serenity Turner-Douglas was last seen leaving Elkins High School.

An Amber Alert has been canceled for a 15-year-old girl who was reported missing from Missouri City on Wednesday. Authorities say the teen walked into a Child Protective Services building on Thursday.