Updated at 12:35 p.m. ET
The mayor of the Polish city of Gdansk, Pawel Adamowicz, has died a day after he was stabbed in the heart and abdomen at a charity event attended by thousands of people.
Adamowicz, 53, was onstage after speaking at Sunday's finale of the annual Great Orchestra of Christmas Charity event, which raises money for medical equipment to treat sick children. TV footage showed Adamowicz telling the audience it had been a "wonderful day" just before he was attacked, The Associated Press reports.