Sri Lanka, July 27 -- At least 11 people have been injured in a stabbing at a Walmart supermarket in Michigan, authorities say.

One suspect was in custody following the incident in Traverse City, authorities confirmed. Local media reports said three people were undergoing surgery.

A nearby hospital said it was treating 11 victims. "As a result, our Emergency Department is currently experiencing a higher-than-usual volume of patients," Munson Medical Centre said on social media.

Footage posted online shows multiple police and ambulance units in the carpark of the Walmart.

Grand Traverse County Sheriff's Office confirmed it was investigating "a multiple stabbing incident at the Wal-Mart in Traverse City".

FBI Deputy Director Dan Bongin...