As the firing stopped, four people were seen bleeding profusely. Two brothers identified as Israr and Imran died on the spot while another youth, Musheer, died later, police added.
Another youth Rahul aka Sonu was critically injured. He is being treated at a local medical facility.
Musheer is relative of the district Samajwadi Party (SP) chief Tanveer Khan.
Superintendent of Police (SP) S Chenappa said additional police force has been deployed at the spot and a probe is under way to find the reason behind the killings.
Speaking on the incident, Police official says,'1 person has got critically injured also & has been referred to Lucknow for treatment. Cause of incident isn't known as yet. Action will be taken against culprits. Investigation underway'