A 24-year-old man who killed six people and injured 15 others in a shooting attack in Poland's Krakow on Saturday died in hospital on Monday morning while receiving treatment.

Police said the suspect, who was shot by officers attempting to stop the attack, had been taken to hospital in critical condition after the incident and underwent several operations before he died.

Attack in Krakow's historic district

Authorities said the attacker carried out the assault in a tourist square in the Old Town district of Krakow, Poland's second-largest city.

According to preliminary information, the suspect drove into the area before launching the attack, causing multiple casualties among people in the square.

Police intervened to end the attack and wounded the suspect, who was later transported to hospital under medical supervision.

Family members found dead at suspect's home

Following the attack, authorities discovered the bodies of the suspect's sister, mother and father at the family's home in Ostrowiec Świętokrzyski, located about 150 kilometres northeast of Krakow.

Investigators believe the three family members were likely killed by gunfire, though details of the incident remain under investigation.

Residents mourn victims

Memorial ceremonies were held in central Krakow after the attack to honour those who lost their lives.

On Sunday evening, many people gathered at the square where the shooting took place, leaving flowers and candles near bullet marks as they paid tribute to the victims.

Authorities continue investigating the circumstances surrounding the attack and the events that preceded it.(ILKHA)