One Direction to increase security

One Direction are having their security increased after two members were mobbed by fans in New York.

Liam Payne and Niall Horan - who are joined in the boy band by Harry Styles, Zayn Malik and Louis Tomlinson - were attacked by a gang of 60 screaming girls outside their hotel, with Payne having his t-shirt ripped and Horan having his hair pulled on Sunday.