Police have stepped up patrols in Northfields following the arrest of a man who took a gun to a children's playground.
The man visited Morton park, off Hastings Road, and produced an imitation firearm to a group of youngsters.
One of the children took a picture of the man and showed it to a parent who called the police.
Officers later arrested a 57-year-old man at an address in Brighton Road, a few hundred meters from the playground.
He has been released on police bail.
Following the incident last Tuesday, Merrydale Infants School, in Claydon Road, sent a letter to parents telling them about what had happened.
Now, police said they are keen to reassure residents that they are investigating the incident and that extra patrols are being carried out in the area.
A spokesman for the police said: "Rumours have been circulating as to the reasons behind the incident and officers have been in the area speaking to local people.
"The matter is still under investigation and detectives are keeping an open mind as to the motivation for the incident but the firearm has been confirmed as being an imitation gun.
"We would like to continue to reassure people that incidents such as these are extremely rare in Leicester, Leicestershire and Rutland and we will continue to work with all our communities to address any concerns."
It comes as armed officers were also called to home in Manston Close, Thurmaston - just two miles from Hastings Road - on Thursday, after a man with an air rifle barricaded himself in the house for 10-hours. He was later arrested.
There is nothing to suggest the arrests are connected.
Anyone with information about either of the incidents can call police on 101.
