updated 06/21/2011 AT 7:05 AM ET
•originally published 06/20/2011 AT 6:45 AM ET
Amy Winehouse’s current European tour, which was to have included 12 stops before winding up Aug. 15 in Bucharest, Romania, has been canceled, it was announced Tuesday morning.
The problem began Saturday night. Attempting to perform while appearing to be under the influence, Winehouse was booed in Belgrade after arriving on stage an hour late, then stumbling around and slurring the words to her 2008 song “Just Friends.”
She greeted the crowd of 20,000 by shouting, “Hello, Athens,” reports the U.K.’s Telegraph newspaper.
Following the incident, Winehouse, 27, apologized to fans and canceled Monday’s scheduled performance in Istanbul and Wednesday’s in Athens.