LEWES, Del., (CBS) —  A teen reportedly was bitten by a shark, forcing state officials to delay the opening of swimming areas at Cape Henlopen State Park on Tuesday.

The Delaware Department of Natural Resources and Environmental Control made the announcement Monday night.

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Officials say the 16-year-old boy told DNREC Parks Enforcement that he felt something grab his arm around 5 p.m. Monday while he was standing in about five feet of water.

The teen then used his right arm to flail at what he described as a shark to get it to release its bite before it swam away, according to officials.

Lifeguards on duty at Cape Henlopen treated his cuts. The Lewes Fire Department transported the teen to Beebe Medical Center by ambulance where he was treated for gashes on his left forearm.

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Chief Wayne Kline of Parks Enforcement said that the main swimming beach at Cape Henlopen State Park will delay allowing swimmers in the water Tuesday until later in the morning, while lifeguards who go on duty at 9 a.m. and DNREC marine biologists monitor the water.