Officers have set up cordons in areas including the junction of Shaw Road with Shaw Street, Mortimer Street, the junction of Bower Street and Gold Street, and Huddersfield Road.
Supt Phil Hutchinson said officers were “following multiple lines of inquiry to understand what has led to this shooting as quickly as possible, and to provide reassurance in the community”.
He added: “Hearing of incidents involving firearms, particularly where someone has been injured, I know will be shocking for most people.
“We have officers speaking to witnesses and residents locally, but welcome anyone with information or concerns to raise these with those on the ground.”
