Pakistani flags were waved at the rally of separatist Masarat Alam in Srinagar on Wednesday
Union Home Minister Rajnath Singh has said that India's unity and integrity were "inviolable" and nobody will be allowed to break them.
"I would like to assure the countrymen that no one will be allowed to break the unity and integrity of the country be it Masarat Alam or anybody else," Mr Singh told reporters on Friday after addressing a rally in Kanpur.
The Jammu and Kashmir government had yesterday allowed separatist leader Syed Ali Shah Geelani to hold a rally in the outskirts of Srinagar where his supporters including Masarat Alam raised pro-Pakistan slogans and others waved Pakistani flags.
Defending the PDP-BJP coalition government of Jammu and Kashmir, the Home Minister said that even state government hadn't anticipated such anti-India activities.
He also congratulated Jammu and Kashmir Chief Minister Mufti Mohammad Sayeed over Alam's arrest.
India needs to maintain better relations with Pakistan as it is a neighbouring country. But whenever they indulge in anti-India activities, a strong message is sent to them, he said.