Two more cruise lines are hiring lifeguards for swimming pools following a series of drownings or near-drownings involving children.

NCL said it will begin employing certified personnel at all of the family pools across its fleet.

The service will start this summer on four vessels and on the remainder by early 2018.

"Norwegian has stationed pool monitors on our largest ships since 2015 and we are now taking further steps to ensure the safety of our youngest guests with the addition of certified lifeguards across our fleet,” said Andy Stuart, president and chief executive officer.

“While