Police in Utah are investigating the brutal stabbing attack that killed a woman working alone last week at a Midvale massage parlor.

Yuping Jiao, 45, was an Chinese immigrant. She was attacked sometime between 1 p.m. and 7:30 p.m. on January 4, KSL reported.

The Unified Police Department said it has identified several persons of interest, but “their involvement is yet to be determined.”

“The circumstances surrounding this heinous crime are deeply concerning,” police said Thursday. “The victim was working alone at the time, and the motive for the homicide remains unknown.”

Police warned employees in similar occupations to “exercise extreme caution,” according to KSTU.

Investigators ask anyone who may have been in the area of 7444 S. State Street between 1 p.m. and 7:30 p.m. on January 4 to call them at 801-840-4000.

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[Featured image: Yuping Jiao/Unified Police Department]