Police are looking for a man who was seen firing a handgun in a street.
West Midlands Police said the offender, aged between 18 and 20, fired the weapon in Stamford Road in the Handsworth area of Birmingham.
There were no reports of any injuries and detectives said they believe at least one other person was involved. Nearby roads have been cordoned off.
Shots were fired at two unarmed officers in the city centre and also at two cars in Halesowen on Tuesday.
The man involved in the latest incident is described as black and wearing a black hat, gloves and grey clothing.