A store clerk stabbed in the neck and shoulder during a stickup managed to chase the masked robber out of his store, according to surveillance footage police released Wednesday.

The clerk of the Super Speedy Mart on Route 130 was seriously injured in the March 19 crime, but has since been released from the hospital, Burlington City Police Capt. John Fine said Wednesday.

The robber, who police are trying to identify, got away with an unknown amount of cash.

Fine said police are also trying to identify a person who can be seen on the video entering the store, but then leaving after seeing the clerk and robber scuffling behind the counter.

"I really want to know who that person was, because they're a witness," he said.

Police said a man wearing dark clothes and a mask came behind the counter of the store around 2:30 p.m. and tried to kick the man. The video shows them talking and then the man takes the store clerk to the ground.

Eventually he takes what appears to be money and runs out, with the clerk not far behind him. Fine said the 911 call that alerted them to the assault and robbery came from a neighboring business.

Police believe the suspect is a male, approximately 5 feet 8 inches, with a medium build.

"We had a couple preliminary leads but nothing of substance that we're now following," Fine said.

They're hoping someone might be able to identify the man from the video, but no tips had come in by Wednesday evening. He said investigators are also looking into surveillance footage from other area businesses.

Anyone with information about the incident is asked to call Detective Anna Czajka at 609-386-0262, ext. 221 or leave a confidential "etip" at burlingtonpolicenj.com. Tipsters can also message the department on Facebook. All messages will remain confidential.

Rebecca Everett may be reached at reverett@njadvancemedia.com. Follow her on Twitter @rebeccajeverett. Find NJ.com on Facebook.

Have a tip?Tell us. nj.com/tips