Irish rock group U2 has postponed ten concert dates on their world tour.

The concerts were to take place next month in Japan, Australia and New Zealand, but will be delayed due to an illness in one of the bandmember's family.

No other details were given, although the tour promoter said that the concerts would be rescheduled as soon as possible.

U2 had a very successful evening at the recent Grammy Awards, winning five categories for their album How to Dismantle An Atomic Bomb.