An unknown person opened fire on the central square of Krakow, the Main Market Square.
According to Polish media, which cite emergency services, at least two people were killed and 10 were injured.
According to Gazeta Wyborcza, the shots were fired from a car driving through the square.
The State Fire Service urges city residents not to leave their homes until the police notify them that a criminal or criminals have been apprehended.
Polish Prime Minister Donald Tusk said the police had launched an investigation and he was receiving operational information from the Ministry of Internal Affairs.
The message is being updated.
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