CHARLOTTE, N.C. (WBTV) – The case of three missing Charlotte coworkers is being investigated as a homicide, Charlotte-Mecklenburg police said in a briefing Tuesday afternoon.

Twenty-three-year-old Tru Quan Le “Sandy,” 17-year-old Alexandro Castillo and 19-year-old Ahmia Feaster were all reported missing over the past week under suspicious circumstances. Officials believe the disappearances of the woman and teens, who all worked together, are connected.RELATED: Woman, 2 teens reported missing from Charlotte believed to be connected

Police say the case now involves police in Arizona and the FBI. Castillo and Feaster are believed to be in Mexico.

A reward of up to $10,000 is being offered for information in the case.

Officers say a citizen called 911 around 7 a.m. Saturday saying they’d found a 4-door red, 2007 Dodge Caliber, which belonged to Feaster. The vehicle was located in the 11000 block of Dulin Creek Boulevard.

Le went missing Wednesday from her home in the 9000 block of Seamill Road. Thursday, family members of Castillo, known as “Alex,” said he had not returned home after being picked up from his home on Stonehaven Drive.

Police said Castillo was picked up by Feaster that afternoon. Feaster was reported missing by her family Friday.

A private investigator tells WBTV Feaster and Castillo called their families Saturday night, to tell them they are safe, but don’t know where they are. Their families believe they are being held captive, and were forced to make that phone call.

They all worked at Showmar’s on Little Rock Road.

Le’s uncle said she was last traced to the QuikTrip on Eastway Drive. He said she had agreed to meet a friend who owed her $1000. She left her home Tuesday night.

However, bank statements show Le actually withdrew another $1000 instead of depositing the money she was owed.

“Her bank account is cleared. There’s no money in there,” Ly said.

Le is described as 4 feet 8 inches tall weighing 110 lbs. She has black hair and brown eyes. She was last seen driving a black 2003, 4-door Toyota Corolla with NC tag ZVE-1262. That car still has not been seen.

Castillo is described as standing 6 feet 1 inch tall, weighs 180 lbs, and has black hair and brown eyes.

Feaster is a female around 5 feet 3 inches tall who weighs 119 lbs. She has black hair and brown eyes. She was last seen picking Castillo up from his home in a red, 4-door Dodge Caliber with NC tag DDD-2681.

Anyone who sees or has information about these three missing persons is asked to call 911 immediately. In addition, you may also call Crime Stoppers at 704-334-1600. Detective J.L. Tuttle is the lead detective in this case.