Delaware State Police say the incident happened around 4:50 a.m. Sunday as two males entered the Wawa on New Linden Hill Road.
They displayed handguns and demanded money from a 68-year-old male clerk.
As the clerk was walking to the sales counter,, he was shot in the thigh by one of the suspects.
The suspects then removed an undisclosed amount of money from the register as well as cigarettes and fled from the store.
As the suspects were fleeing, they noticed a 58-year-old man from Millsboro, Delaware outside of the store sitting in a car. The suspects then fired two shots toward the man, striking his vehicle.
The suspects then fled through the parking lot.
The store clerk was treated by EMS and transported to the Christiana Hospital where he was treated and released.
The second victim was not injured.
The first suspect is described as 5'8 to 5'10, with an average build. He was last seen wearing a red hooded sweatshirt, dark gloves, blue jeans, tan boots, and was wearing a face mask. He was also armed with a dark handgun.
The second suspect is described as wearing a dark hooded sweatshirt, light gloves, and was also armed with a handgun.
Wawa officials hope the reward will "expedite bringing the perpetrator of these crimes to justice."
Robbery detectives are asking anyone who may have any information in reference to this incident to contact them at Troop 2 at 302-834-2630 ext. 6 or Crime Stoppers at 1-800-TIP-3333. Tips may also be submitted online at www.tipsubmit.com.