The police underwater search team for the region sent divers into the River Don, off Attercliffe Road, Attercliffe, after a member of the public reported spotting somebody throwing a suspicious package into the water.
A BB gun was recovered from the water.
APPEAL: Knife held at man's throat during street robbery in SheffieldA South Yorkshire Police spokeswoman said: "Specialist officers from the underwater search team carried out a search in the River Don, off Attercliffe Road.
POLICE: Closure notice granted at Sheffield Spice den after neighbours complained of users 'urinating and defecating' in street"The search followed a report from a member of the public that a suspicious item had been thrown into the water.
"The item was recovered and was found to be a BB gun. It has been placed into our property store."