North Belt officers received a call on Monday at about 8:54 p.m. of a robbery at a Family Dollar in the 11000 block of Airline Drive.
According to HPD, a hold-up alarm was set off after three suspects came in and held up the store with the clerk inside.
The clerk was shot in the lower leg, and the three suspects fled on foot, police said.
It is unclear if there were any customers inside the store.
The store was operating regular business hours at the time.
An investigation is underway to determine if anything was taken , HPD said.