Homes were evacuated and bomb disposal experts were called in after three hand grenades were discovered at a home in Sileby.
Residents in Peashill Close were evacuated for about seven hours.
Police said they went to the property at 3.30pm yesterday to search it after they had arrested the occupant for reasons that have not been disclosed.
As they searched the home they found three grenades and the Army were called in to make them safe.
During the emergency several residents, some of them elderly, had to leave their homes in case of an explosion in the quiet village street.
A police spokeswoman said today: "At around 3.30pm on Friday during a search of a property in Peashill Close in Sileby, what are believed to be three grenades were found.
"In the interests of public safety a cordon was put up around the property and homes were evacuated.
"We requested an explosives team from the Ministry of Defence to attend."
