One Direction's Liam Payne worries about US One Directioners getting hurt!

 Liam Payne has urged frenzied US One Direction fans who wait for the group after their concerts to calm down for their own safety.

Liam, 18, says he and the other 1D boys are keen to meet more American Directioners, but the way they 'run forward' could lead to a dangerous situation.

'Hey hope nobody got hurt we would love to come say hi but because it gets crazy like that we don't want you to get hurt xxx,' Tweets Liam.

'If you guys promise to stay calm and stay back and let us come to you maybe tomorrow we can say hello would be nice :).'

Liam and his band mates Louis Tomlinson, 20, Zayn Malik, 19, plus 18-year-olds Harry Styles and Niall Horan have been over the pond since May.

But they'll be back in London after their first headline tour of the country comes to a close at the end of this month.Liam has reassured 1D's British followers that they haven't forgotten them.

'missing the uk fans too cant wait to see you all when we land hope ur well :),' he Tweets.