Prosecutors in Poland have formally opened an investigation into a mass shooting that occurred in Krakow on Saturday, with authorities now intending to treat the incident as a terrorist act. Tomasz Waszczuk, a prosecutor, informed ABC News that findings so far strongly suggest these motives behind the attack.

The shooting, which took place in a market square, resulted in the deaths of at least six people and injured several others. The suspected shooter was wounded by police during apprehension and remains in critical condition in the hospital. Authorities are awaiting his recovery before they can question him.

Adding a grim layer to the investigation, three other individuals were found dead inside the suspected attacker's home in Ostrowiec Swietokrzyski. Polish police confirmed these deceased individuals were the alleged shooter's 53-year-old father, 52-year-old mother, and 21-year-old sister. Counterterrorism officers conducted a thorough search of the apartment for explosives, concluding their operation Sunday morning.

Prosecutors are preparing to file six murder charges related to the Krakow victims. This number could increase to nine if the attacker is also found responsible for the deaths of his family members. The 24-year-old alleged attacker has undergone multiple surgeries and is under constant police guard, though he has not yet been formally detained due to his critical medical state.

Regarding the possibility of other individuals being involved, Prosecutor Waszczuk stated that current evidence does not indicate further accomplices, but investigations will continue to explore all avenues. Investigators are meticulously examining the attacker's background and evidence collected from various locations.

The incident also saw two police officers injured. One officer was brought out of a medically induced coma on Sunday morning, while the other remains in a stable but medically induced coma. Both officers are expected to survive.

Among the injured civilians, 11 are Polish nationals. Five foreign nationals were also among those wounded, including individuals from Austria, Portugal, Germany, Britain, and Russia. These individuals are receiving treatment across six hospitals.

The attack has sent shockwaves through Poland, prompting a swift and serious response from law enforcement and judicial authorities, who are now treating it as a potential act of terrorism.