The death toll in police firing during violence protests against the divisive amended citizenship law rises to three with one more person succumbing in the southern city of Mangalore in BJP-ruled Karnataka.

The face-off between firebrand West Bengal Chief Minister Mamata Banerjee and Governor Jagdeep Dhankhar has escalated ever since the amended Citizenship Bill became a law last week.

Washington and London issue travel warnings for northeast India as opponents of a new citizenship law geared up for more protests Saturday, following days of clashes that saw two people killed and dozens injured.

Schools and colleges were closed, markets were shut and vehicles remained largely off roads in parts of Nagaland in India today amid a six-hour flash general strike called by the Naga Students' Federation (NSF), protesting against the amended Citizenship Act, officials say.

Three protesters are killed and many others injured in a police firing in Assam's Guwahati of India amid a raging agitation against the Citizenship (Amendment) Bill.