Firefighters look at the charred remains of two duplexes on the 4800 block of Central Avenue. Two beachfront duplexes were destroyed and a third was badly damaged during an early morning fire Thursday on Central Avenue in Ocean City. No injuries were reported.The Ocean City Fire Department responded to multiple calls reporting a structure fire on the 4800 block of Central Avenue at 3:20 a.m.Firefighters arrived to find the third floor of a beachfront duplex fully engulfed in flames. The fire had spread to the homes on both sides of the duplex, according to a city press release.Each of the duplexes at 4829 and 4835 Central Ave. was unoccupied at the time of the fire. No residents or firefighters were injured, authorities said.Firefighters prevented the blaze from spreading further and controlled the fire quickly, but the two duplexes were destroyed and a third duplex next door had extensive damage. The cause of the fire remains under investigation.Fire companies from Marmora, Strathmere and Margate provided mutual assistance, along with a TriCare EMS team from Somers Point, the Upper Township Rescue Squad and AtlantiCare paramedics.OCNJDaily.com will update this story as more details become available.