Patrols have been stepped up in a residential area of Leeds after blank rounds were fired in the street by a man on a mountain bike.
A detailed police search of the scene in Harehills yesterday led to the discovery of two casings, which were found to be from blank rounds.
West Yorkshire Police said today that no other evidence or damage consistent with real shots having been fired in Compton Row.
Detective Inspector Charlotte Hails, of Leeds District CID, said: "The caller reported seeing two males on mountain bikes with one discharging a handgun type weapon into the air.
"Officers attended and recovered two casings, that were sent for specialist examination and found to be from blank rounds.
"The scene was subject of a detailed search and no other evidence or damage consistent with a real firearm discharge was found."
The incident had taken place at about 12.30am yesterday but was not reported until around 7.50am.
Det Insp Hails said: "We are carrying out enquiries into the incident and would like to hear from anyone who saw two or three males in the area or who has any information that could assist the investigation.
"They were described as white, skinny and wearing grey hooded tops and man-bags.
"We are also liaising with our colleagues in the local neighbourhood policing team who will increasing their patrols of the area to reassure residents."
Anyone with information is asked to contact Leeds District CID via 101, quoting log number 359 of June 20.
Alternatively, call the independent charity Crimestoppers anonymously on 0800 555 111.