Push for new US storm shelter laws

The mayor of a town in Oklahoma has asked for a law meaning every new home in America will be built with a storm shelter.

Glenn Lewis is the mayor of Moore, where at least 24 people were killed by the tornado that hit there this week.

He says the law will mean more people will be safe if a tornado strikes in the future.

Watch BBC news reporter Tim Muffett as he explains what difference the shelter laws could make.