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A four-year-old boy has died on board Norwegian Breakaway this week, while a six-year-old has been airlifted to the closest hospital.

According to a Norwegian Cruise Lines Facebook update, the two children were found unresponsive on the pool deck.

They had been pulled from the cruise ship’s swimming pool.

A medical team administered CPR to both children, but only one awoke.

“We are extremely saddened to report that a tragedy occurred on board Norwegian Breakaway this morning,” the statement read.

“Our emergency medical team was called and notified that two small children were unresponsive on the pool deck.

“The team responded immediately and quickly administered CPR to both children.

“The older child was then airlifted by the U.S. Coast Guard to the closest medical facility, accompanied by his grandmother and a nurse from the ship.

“Devastatingly, the younger child passed away on board.

“We extend our deepest sympathies to the family during this extremely difficult time and are providing full assistance and support.”

The line has not yet revealed whether the boys were under the line’s Splash Academy care or under family supervision.

A passenger on board the ship, Brian Albelli logged onto his Facebook account to post a message on the line’s Facebook update.

He said the youngsters didn’t look old enough to be left alone.

“On the Breakaway right now, just logged on to see if there was any news,” he wrote.

“These two kids didn’t look old enough to even be able to read a sign or pool depth.

“Still shaken up after witnessing it.”