Shia Muslims in the city and its adjoining areas took out processions Friday on the occasion of Muharram, braving intermittent rain, a senior police officer said.
The devotees, carrying tazias, black flags and traditional arms, were seen beating their chests in a ceremonial mourning across the metropolis.
Several clerics and leaders, including Trinamool Congress MP Idris Ali, had appealed to the devotees Thursday to refrain from taking out armed processions.
Maulana Mohammed Shafique Qasmi, the Imam of Nakhoda Masjid, said there was "no mention of armed processions during Muharram is the Islamic laws".
"The city's Muslim-dominated areas Park Circus, Rajabazar, Kidderpore, Iqbalpur, Mominpur and Metiabruz