District 6 officers responded to a Call for Help in the area of N. Grand and W. Florissant, shortly before 2:00 p.m. on July 4.
A 40-year-old female told officers that she responded to the area to purchase illegal drugs.
She met a man who instructed her to follow him to another location to conduct the illegal transaction.
When the woman followed the man to the area of N. Grand and Penrose, the man produced a firearm and announced a robbery. Taken were two purses belonging to the woman.
The investigation is ongoing.