Three persons were killed and six injured in police firing in Assam's Golaghat town today when a mob tried to set ablaze the deputy commisioner's office and a police station and targetted a hospital, after which indefinite curfew was clamped in the areas.

The mob was protesting yesterday's police action at Rangajon where people were allegedly dragged out of their homes and beaten up.

The police fired tear gas shells to control the mob of over 1,000 people at Erengapara Chariali in Golaghat town marching to the DC's office and police station to set them on fire.

When the protestors began throwing stones at the police while reaching within 300 metre of the two buildings, the police opened fire killing three persons and injuring six, police said.

Golaghat district Superintendent of Police Siladitya Chetia told reporters that the police tried to halt the protestors as per prescribed rules but had to perform its duty of controlling the situation when they remained defiant.

"Police had to take action as the mob was targeting public service and public utility buildings and Kushal Konwar Civil Hospital in the town."

"Also civilians were injured in stone-pelting by the protestors warranting the firing," he said.

The incident occured when local TV news channels were beaming live the situation in the area.

Some policemen received minor injuries in stone-throwing, the sources added. The injured were admitted to the hospital, they said.