Around 50 alleged MNS activists were on Tuesday picked up in connection with stone pelting at city buses on Monday night after suspension of four party MLAs in the Maharashtra Assembly, police said.
Those detained by police included MNS city unit president Prakash Dhore.
Atleast 30 buses were damaged in the incidents from various parts of the city in which the party activists came on the streets to protest against happenings in the Legislature.
The trouble started from Varje area (Khadakwasla constituency) from where Ramesh Wanjle, one of the suspended MLAs has been elected to the House.
The buses were halted and vacated, causing inconvenience to the passengers who were seen stranded mid-way.
An effigy of Samajwadi Party MLA Abu Azmi was also burnt by MNS workers who raised slogans against him for "insulting" Marathi by taking the oath in Hindi.
Security in the city has been tightened following last night's incidents, a police spokesman said.