"Conor Oberst fell ill whilst on tour in Jacksonville, Florida," band says in statement. "Conor will be heading home to Omaha to recuperate"
Reunited quintet will release 'Payola' – their first album in 13 years – this month
Conor Oberst-fronted rockers champion recent uprisings
Recently reunited post-hardcore act takes aim at Arizona lawman known for tough anti-immigration stance
Surprise show followed a pub quiz win