[UPDATE: The sold-out show has now been rescheduled for Sept. 10. Refunds for fans who can't make the new date must be requested by March 4 via the eTix site.]

One of the most anticipated concert tours of the spring, Massive Attack's 20th anniversary celebration of its "Mezzanine" album has been postponed in North America until the fall due to illness.

Ticketholders for the March 24 date at Palace Theatre in St. Paul are being told their original tickets will be honored at the make-up date, which will be announced next week.

"The band are deeply sorry for any inconvenience and are looking forward to bringing the show to the USA and Canada soon," read an announcement from the British electronic group. It did not specify further about the illness.

The tour, which is to feature the elusive Liz Fraser of Cocteau Twins on vocals, was supposed to start on Monday in Montreal. Coincidentally, this is the second show this month at the Palace to be sidelined. James Blake's Palace gig this past Tuesday was outright cancelled, with no make-up date in sight.