Deadly protests erupt in universities across India over contentious citizenship law.

Protests by students and others have erupted in many universities across India, in support of their counterparts at Delhi's Jamia Millia Islamia after Sunday evening violence.

Police fired teargas shells and beat students inside the campus of Jamia - a central university - after students were protesting against the new citizenship law, granting citizenship to non-Muslims from Pakistan, Afghanistan and Bangladesh.

Critics say the law discriminates against Muslims and is against secular principles of the constitution.

Jamia Millia Islamia, - located in southeast Delhi and founded by Dr. Mukhtar Ansari a century ago, soon after he returned India after leading a medical mission to treat wounded Turkish soldiers in the First Balkan War - witnessed widespread violence on Sunday evening.

By midnight, protests also spread to other Indian cities like Hyderabad, Varanasi, Kolkata, Puducherry, Lucknow and Mumbai, as students raised their voices against the alleged brutal police assault on Jamia students, local outlet news18 reported.

The violence has left more than 125 students of the premier central university injured, the report said.

In Delhi, thousands of people gathered outside the Delhi Police headquarters and shouted police 'sharam karo (have shame),' after a protest call by the Jawaharlal Nehru University students, it added.

A group of students on Monday stood shirtless in the bone-chilling cold outside the Jamia gates to protest against the police action.

Vice Chancellor Najma Akhtar and Chief Proctor Waseem Ahmed Khan confirmed that the police had entered into the campus, without their permission.

'Police entered the university without permission and attacked students,' Khan told Anadolu Agency.

At least 50 students have been detained by the police without any charges, said the Jamia administration on the twitter.

'Police couldn't differentiate between the protesters and students sitting in the library. Many students and staff were injured,' said the vice chancellor.

Many girl students are in a state of shock and are not in a position to speak after they were attacked by police.

Mohammad Alamullah, an eyewitness refuted reports that police had responded against violent protests. 'A peaceful protest against citizenship bill was organized in the morning and had ended by noon,' he said.

Alamullah, who works as media consultant in the university, said that students were left bleeding in the library and on roads and many women hid in the bushes...