It happened at 9:50 a.m. Tuesday at the Suburban Plaza Shopping Center on Elkton Road.
Police say two suspects, described as black males wearing hooded sweatshirts with their faces concealed, entered the store.
One of the suspects, who was armed with a handgun, approached a 60-year-old male clerk who was seated on a stool, knocked him to the ground then forced him into a closet in the back of the store.
The second suspect approached a 55-year-old male clerk and forced him to a back store room and demanded the clerk turn over cellular phones.
After giving the suspect an unspecified number of phones, the second clerk was then forced into the same closet with the other victim.
Both suspects fled in an unknown direction.
No one was injured.
Anyone with information about the suspects or crime is asked to contact Det. Michael Watson at 302-366-7110 ext. 133 or firstname.lastname@example.org
You can also send an anonymous text message tip by texting 302NPD and your message to TIP411.
Information can also be provided anonymously to Crime Stoppers at 1-800-TIP-3333 or via the internet at www.tipsubmit.com where a reward may be available.