A 24-year-old man killed six people and injured 15 others Saturday in Krakow after driving through the Main Square of the Old Town before police shot and wounded him. Poland observed the start of two days of national mourning on Sunday following the defense minister describing the violence as an act of terror.

Authorities located the bodies of the man's mother father and sister at their home in Ostrowiec Świętokrzyski about 150 kilometers northeast of the city with deaths likely from gunshots. Gun rules in Poland are more extensive than in the United States requiring a permit after background checks psychological tests and a stated purpose yet the killer and his father both had permits.