the missing persons inquiry Criminal_investigation which followed was one of the largest in the history of west yorkshire police Patrolling , involving Cause_to_be_included the search Scrutiny of around 1,750 buildings Building , underwater searches Scrutiny of thirty-two drainage Emptying wells , the draining Emptying of a two-mile section of canal and the halting Hindering of household waste collections .

A shelter-in-place order was issued Statement to residences and businesses within a two-mile ( 3.2 km ) radius of the plant .