A leftist mayor in Poland was stabbed Sunday night by an assailant of political grievances, officials said.

Pawel Adamowicz, mayor of the coastal city of Gdansk, in the north of the country, was stabbed to the heart while he was speaking at a fundraiser organized by the Grand Orchestra of Christmas Charity, a reported the Good Non Profit agency.

The attacker has shouted since the stadium that he had been wrongfully imprisoned under a previous national government led by Civic Platform, a centrist party, the AP said.

Mr. Adamowicz was formerly a member of the Civic Platform, which is now the largest opposition party in Poland. Jerzy Owsiak, head of the Big Orchestra of Christmas Charity, is a liberal critic of Law and Justice, the right-wing, populist party that came to power in Poland in 2015 in favor of the rural vote.

Mr Adamowicz, 53, has been mayor of Gdansk since 1998 and was re-elected as an independent candidate in the November elections. highlighted a deep gap between the liberal cities of Poland and the conservative campaigns. He defended gay rights and tolerance for minorities, and expressed his solidarity with the Jewish community of the city last year, when the window of a synagogue was broken.

According to the police quoted by the police, the suspect in the knife attack was a 27-year-old man who had apparently committed burglary and had previously burgled at a bank. badge.

Mr. Adamowicz was taken to the Gdansk Medical University for surgery after the attack. Medical examiner Tomasz Stefaniak, a doctor at the hospital, reportedly said Monday morning that Mr Adamowicz was alive but was "in a very serious state".

Sadiq Khan, Mayor of London, condemned the attack on Mr Adamowicz in a post posted on Twitter and expressed his solidarity "with the city he runs, his family and his supporters".