Depeche Mode has posted a string of show cancellations as band frontman David Gahan undergoes treatment for gastroenteritis. The band was forced to postpone its May 12 concert at Terra Vibe Park in Athens, Greece, when Gahan was rushed to the hospital just before show time. A May 14 cancellation in Istantbul, Turkey, followed.

Now, four more dates have been cancelled — May 16 at Izvor Park in Bucharest, Romania; May 18 at Vasil Levski Stadium in Sofia, Bulgaria; May 20 at USCE Park in Belgrade, Serbia; and May 21 at Arena in Zagreb, Croatia.

The band’s Web site advises ticketholders to hold on their tickets for word of rescheduled dates or final cancellations. In the case of cancellation, refunds will be available from the original point of purchase.

TFL and ATBS for ticketing professionals

The next scheduled stop on the group’s Tour of the Universe is May 23 at Gwardia Stadium in Warsaw, Poland. The tour kicked off with a warm-up show on May 6 in Luxembourg and continues internationally through July 12 in Seville, Spain.

The tour’s North American leg runs from July 24 in Toronto, ON, through September 5 in Fort Lauderdale, FL. A leg in Mexico and South America, as well as a second European leg run from October 1 through December 16, finishing up with two shows in London, England, at the O2 Arena.