A female construction worker who has yet to be publicly identified was stabbed Friday while escorting a couple away from a job site on Shipley Street, an alley between Folsom and Harrison, near Fifth. ABC 7 reports that the incident happened just before 9:30 a.m.

According to KRON 4, via SFPD spokesperson Grace Gatpandan, there was an argument, and the woman the led the two suspects out of the construction area. When coworkers noticed she had not returned, they went out to the street to find her stabbed. They then chased down the two suspects, who were walking away, and called police.

The construction worker died shortly there after from her wounds.

Mayor Ed Lee issued a statement about the death, saying in part,

On behalf of the City and County of San Francisco, I extend my deepest condolences to the family of the victim who died after being stabbed. Our thoughts and prayers remain with her family, friends and colleagues during this time of mourning and sorrow. The victim was a 2013 graduate of the CityBuild program and a proud member of Laborers’ Local 261.

The suspects are detained and this is being investigated as a homicide.