Chief Chad Russell of the Andover Fire Department said a tornado hit Sedgwick County and travelled into Andover.
The tornado hit 966 buildings, but crews confirmed damage to city hall.
Crews have completed their primary assessment and will now begin their secondary assessment, which should be completed by Saturday morning.
Butler County EMS reported five patients, two of whom were firefighters, with minor injuries.
No serious injuries have been reported in Butler County.
Sedgwick County EMS reports three EMS calls, one serious and two non-critical.
The public is asked to leave the impacted area while emergency crews assess the situation.