Police are investigating a mass stabbing where a 42-year-old man entered the Walmart in Traverse City and used a folding knife to stab 11 people.

Six of the 11 victims were in critical condition after Saturday's attack, and five were listed in serious condition, hospital officials said.

TRAVERSE CITY, Mich. − Authorities on July 27 were still trying to determine why a 42-year-old man went on a stabbing rampage at a local Walmart, wounding 11 people and prompting chaos as patrons scrambled to exit the building.