BURLINGTON, N.J. (CBS) — Police are questioning a person of interest after an elderly fisherman is thrown into the Delaware River in Burlington.

A 79-year-old man from Riverside suffered a fractured shoulder after being grabbed and thrown into the water while fishing at the Riverfront Promenade in Burlington on Thursday around 10:30 a.m. Witnesses and first responders were able to pull the man from the river. He was taken to Lourdes Medical Center where he has since been released.

“We have an individual appears to be disturbed or in some psychiatric emergency and he’s walking down the riverfront promenade he’s arguing with himself yelling into the river,” said Captain John Fine, with the Burlington Police Department.

First Case Of Super-Resistant Gonorrhea Reported

Police say the suspect then came up from behind the victim, grabbed him and tossed him into the river.

The suspect then fled on foot towards Stacy Street.

On Friday night, police said they have identified a person of interest and are continuing their investigation.

Former Tutor: Foreign Exchange Student Charged In Delaware County School Threat Had ‘Unusual Ideas’ 

If you have any information about the suspect or incident, please call the City of Burlington Police Department at 609-386-0262.