The Columbia Police Department is announcing the search for Mengqi Ji Elledge is now a criminal investigation.
Police say investigators have been working extensively to located Elledge, who was reported missing on October 9.
The investigation has led detectives to suspect foul play in her disappearance.
Very little information is being released in order to protect the integrity of the investigation.
Anyone with information regarding the disappearance of Elledge should call 911 immediately or contact the local law enforcement agency.
To remain anonymous, call CrimeStoppers at 573-875-TIPS.