The Norwegian Breakaway. (Image credit: Norwegian Cruise Line)

One of two children rescued from a pool on board the Norwegian Breakaway has died, the cruise line said Monday.

"Our emergency medical team was called and notified that two small children were rescued from the adult pool, but were unresponsive on the pool deck," Norwegian Cruise Line said on its Facebook page.

The emergency medical team immediately began performing CPR on both children, the cruise line said. "After many resuscitation attempts, the younger child passed away on board."

The older child was airlifted by the U.S. Coast Guard to a nearby hospital accompanied by a nurse from the ship and the child's grandmother, Norwegian Cruise Line officials said. They offered their condolences to the child's family.

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