On Tuesday morning 13 more activists of Raj Thackeray's Maharashtra Navnirman Sena were detained by the police. The new detention came in after many other MNS supporters were released on bail on Monday for targeted attack on people of the north India, mainly including theatres screening Bhojpuri films, North Indian taxi drivers and milk and vegetable vendors.

Samajwadi Party general secretary Amar Singh said action should be taken because Raj Thackeray had been issuing “veiled as well as open threats” to non-Maharashtrians and “exhorting his party cadres to perpetrate acts of violence” against them..

While the party filed a petition with the Election Commission demanding de-registration of MNS, Amar Singh lodged an FIR against the MNS chief accusing him of encouraging attacks on North Indians. However, no action has been taken in this regard.

In a new turn to the row on Monday over the MNS chief’s comments against non-Maharashtrians, supporters followed up clashes on the streets with an attack on Amitabh Bachchan’s Mumbai residence on Sunday night.

The Centre asked the state government to take all steps to maintain law and order.

Late on Sunday night, two motorcycle-borne youths threw glass bottles at Bachchan’s residence Prateeksha in Juhu. The attack followed Raj Thackeray’s comments questioning the star’s allegiance to Maharashtra and accusing him of being more loyal to native Uttar Pradesh.

Bachchan, who’s in Jaipur with family and Amar Singh to celebrate son Abhishek’s birthday, refused comment, but security was stepped up at his Mumbai homes.