At least 20 people died as large-scale protests over Citizenship Amendment Act (CAA) turned violent day after day with protesters went on a rampage all over in country, pelting stones at police, setting vehicles on fire and ransacking a number of police outposts.
There have been reports of firing on police personnel deployed to maintain law and order, they said.
Massive protests have erupted in India following the introduction of the contentious new citizenship law.
At a news conference following the conclusion of an Islamic summit in Kuala Lumpur, Mr Mahathir said Saturday that India is a secular state and the religions of people should not prevent them from attaining citizenship.
Uttar Pradesh Director General of Police (DGP) O. P. Singh has claimed repeatedly that only the protesters used firearms in the ongoing violence.
Fifteen people have died in the state during the protests so far, police spokesman Praveen Kumar said, adding that a "majority of the dead are young people". "We will attach their properties because many faces had been identified through the video footage", he had said.
There has been growing disquiet about the law, which gives people from persecuted minorities from three neighbouring countries an easier path to citizenship, but not if they are Muslim.
A Dalit hero who addressed a meeting of angry protesters at Delhi's historic Jama Masjid was arrested on Saturday, while Muslim clerics who fought for arbitrary divorce rights of men were notable absentees against a law on citizenship that has riled the secular opposition parties.
Critics say the law discriminates against Muslims and is part of Prime Minister Narendra Modi's Hindu-nationalist agenda, a claim his political party denies. Modi has defended the law as a humanitarian gesture.
Delhi's Jamia Millia Islamia University saw women students leading demonstrations, which were then joined by men. The BJP is harming itself by using force and taking action against those who are raising their voice against the CAA.
The violence wasn't limited to the streets.
Friday also saw major protests in the capital, Delhi, with thousands gathering outside one of India's oldest mosques, the Jama Masjid. "Such a list is likely to include a lot of common documents to ensure that no Indian citizen is unduly harassed or put to inconvenience", a ministry spokesperson said in a post on Twitter.
Prohibitory orders under CrPC section 144 have already been imposed in two police stations of northeast Delhi, including Seelampur and Jafrabad, for one month, a rule that restricts the assembly of more than four people at one place.
Adityanath had said that property of those involved in violence would be seized and auctioned to compensate for destruction of public assets during the protests over the amended citizenship law.
Violent protests broke out in the state on Thursday and intensified on Friday.
Muslim leaders believe the new law will be linked to a nationwide exercise where every citizen would be asked to prove Indian citizenship.
India is also building a detention center for some of the tens of thousands of people the courts are expected to ultimately determine have entered illegally.