NORTH CAROLINA -

A 6-year-old boy is being treated at an Eastern Carolina hospital and a 4-year-old boy is dead after both were pulled from a cruise ship swimming pool Monday.

Many details about what happened remain unclear. A hospital spokeswoman says the injured boy's parents did not want his condition shared with the public. And it's unclear whether the two boys were related.

Norwegian Cruise Line says the ship's emergency medical team responded to a report that the children were unresponsive on its pool deck and quickly administered CPR. But they were unable to revive the 4-year-old.

The Marine Corps rescue helicopter, "Pedro," flew to the ship, which was about 22 miles off shore from Cape Lookout, and airlifted the surviving 6-year-old boy, his grandmother, and a nurse to CarolinaEast Medical Center in New Bern, according to officials with Cherry Point. The child was later transferred to Vidant Medical Center in Greenville. There was no word on his condition.

The 18-deck Norwegian Breakaway has several pool areas, including an aqua park with a play area for young children. It also has a supervised program for children called Splash Academy.

A spokeswoman for the cruise line declined to say whether the children were signed into the Splash Academy or were being supervised by family.

Cruise industry experts say pools aboard ship usually are not watched by lifeguards, though Norwegian's ships do have pools specifically for children.

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A 4-year-old child drowned aboard the Norwegian cruise ship, Breakaway, Monday morning off the North Carolina Coast, officials said. The victim's 6-year-old brother survived, and was airlifted to an Eastern Carolina hospital.

According to Norwegian Cruise Line, the two small children were found unresponsive on the pool deck and had to be pulled out from the swimming pool Monday morning. Medical staff on board the ship tried to help both children, but the 4-year-old died, officials said.

NewsChannel 12 contacted Coast Guard officials, who said they got the call of the incident at about 11:30 a.m. Monday.

The Marine Corps rescue helicopter, "Pedro," flew to the ship, which was about 22 miles off shore from Cape Lookout, and airlifted the surviving 6-year-old boy, his grandmother, and a nurse to CarolinaEast Medical Center in New Bern, according to officials with Cherry Point. The child was later transferred to Vidant Medical Center in Greenville. There was no word on his condition.

"We extend our deepest sympathies to the family during this extremely difficult time and are providing full assistance and support," Norwegian Cruise Line said in a statement released on Facebook. "The family is in our thoughts and prayers and we ask that you please keep them in your thoughts and prayers as well."

The 4,000-passenger ship is based in New York and was headed to Florida.