A 40-year-old man has been arrested on suspicion, preparation, and instigation of an act of terrorism.
The injured were rushed to the hospital for treatment. Among those injured include a 19-year-old woman and a 50-year-old man.
Assistant Chief Constable said that none of those injured has sustained life-threatening injuries.
The mall is located close to the Manchester Arena, where 22 people were killed following a suicide bombing outside an Ariana Grande concert.