MELBOURNE, Fla. -

A missing child alert has been cancelled for two girls whose parents were believed to have a pact to kill them, according to authorities.

The Florida Department of Children and Families announced Tuesday night Melbourne police confirmed Trieu "Kiah" Co and Chieu "Kristin" Firth had been safely located in California.

Melbourne police will be holding a news conference Wednesday afternoon. Check back for more updates.

The sisters are two and four-years-old. Authorities said the girls were last seen in Melbourne, Florida.

Law enforcement officials said the children are physically well and in the custody of social workers in California. DCF said officials are working to make arrangements to travel to California to assume physical custody of the girls and return them to Florida.

An active TICO (Take Into Custody Order) has been issued for both children, officials said. Upon their return to Florida, the sisters will be placed in protective custody, with an emergency custody hearing to take place.

The missing child alert was issued on Nov. 30th. DCF said the family fled from child protective investigators during an active child abuse investigation.

Melbourne police told Local 6 the family resides in Vietnam, but came to the U.S. to treat their four-year-old for autism. Witnesses told police the suicide pact was a result of the father's frustration with the expense of treatment, authorities said.

According to police, the parents said they would kill themselves and the kids if they ran out of money.