Six people have been killed after a gunman opened fire from a moving car in Kraków’s historic Main Market Square, a popular tourist destination, on Saturday.
The attack took place at around 3pm local time.
Four women and two men died in the daytime shooting. A British citizen is among the dead.
At least 15 people are reported to have been injured.
The suspect, a 25-year-old Polish man, was shot by police and taken to hospital.
Polish Prime Minister Donald Tusk said that three more bodies were found at the suspect’s home, which authorities continue to search. They are understood to belong to the suspect’s family.
Polish authorities have described the attack in Poland’s second largest city as an act of terrorism.
Poland’s interior minister claimed the suspect had been inspired “far-right ideologies,” while police said he used “military weapons” in the attack.
Two police officers were seriously injured during the incident.
Praise has been directed online at a responding police officer who is understood to have subdued the attacker, and was himself injured in the process.
Donald Tusk called for the circumstances of the crime to be established as he warned politicians against exploiting the tragedy.
“We will establish all the circumstances of this crime,” said Tusk.
Polish police have stepped up security measures in the capital Warsaw in the wake of the attack in Kraków, with additional patrols deployed and road barriers installed.
Kraków has declared a period of mourning until Wednesday.