Pop punk band All Time Low have been forced to cancel a string of shows in South America due to "unexpected circumstances" involving the concerts' organisers.

The act was set to play at the Next Generation Fest 3 in Sao Paulo, Brazil next weekend (27-28Jul13), but the event has been unexpectedly postponed until December (13).

As a result, the group's Friday (26Jul13) show in Porto Alegre has also been pushed back.

A statement from the promoters reads, "Unfortunately due to unexpected circumstances we regret to inform that Next Generation Fest 3, scheduled to happen on 27-28 July in Sao Paulo, is postponed for December 2013. With this the shows of All Time Low... scheduled to happen on 26 July in Porto Alegre are also postponed for December.

"The postponement is not related to (the) band's decision, but only by the organisers, Web Rockers. In the next few days we will announce the new dates and more details for Next Generation Fest 3 and show in Porto Alegre."

In a post on their website, All Time Low add, "We had plane tickets purchased, gear shipped, and were ready and excited to go see you guys. We will be back soon. We are truly sorry that this happened, and feel awful that we can't come."