Supt Martin Simcock tells a meeting the force was "not aware of the planned activity" in Darnall.
Zahira Naz, deputy Sheffield Council leader, say the community would not be "intimidated or silent".
Police were called to a property on Elmham Road in Darnall after reports of a firearms discharge.
Zulkernain and Armaan Ahmed are sentenced for killing Abdullah Yaser Abdullah Taleb in Sheffield.
Mohammed Waheed died after the car he was travelling in hit railings in Sheffield, court hears.
The development, made up of 32 houses and 27 flats, is proposed for Darnall in Sheffield.
Over 100 blank-firing guns were found in various stages of conversion in police raids in Sheffield.
Zulkernain Ahmed is found guilty of killing 16-year-old Abdullah Yaser Abdullah Taleb in Sheffield.
Adam Iqbal is jailed for three years and eight months after helping his brother flee Sheffield.
