Historian Ramachandra Guha was detained during a protest in Bengaluru while he was participating in a peaceful protest at townhall against the new citizenship law.
Other cities like Bhubaneshwar, Mumbai, Pune, Chennai, Bhopal and Hyderabad also witnessed protests today morning.
Meanwhile, West Bengal Chief Minister Mamata Banerjee has asked protesters not to step back.
"We have to get the CAA revoked," Banerjee said today during an address.
"Suddenly after 73 years of independence, we have to prove that we are Indian citizens. Where was BJP's head and tail at that time, BJP is dividing the country. Don't stop your protest because we have to get the CAA revoked," she said.