Garment workers in Savar industrial belt area staged a fresh demonstration on Monday in Ashulia area of Savar demanding a minimum monthly wage of Tk 30,000.
Witnesses said workers of different garment factories took to Dhaka-Aricha highway around 9:30am in Narsinghpur and staged a demonstration.
Around 11:15am, miscreants set fire to a covered van belonging to Ha-Meem Group while it was refuelling at Nadi Filling Station.
Police fired tear gas in front of Ha-Meem Group office to disperse the protesters, triggering a clash.
Chases and counter-chases took place during the clash as the worked hurled brick chips targeting police.
Assistant Superintendent of Police Shoaeb Ahmed of Industrial Police-1 was injured after being hit by bricks thrown by protesters.
Several garment factories in Hemayetpur, Tetuljhora, Fulbaria and Ullail in Savar municipality also declared holiday.
The protesters also visited several garment factories and forced workers to leave their workplaces, disrupting operations in the area.
Additional police and members of the Armed Police Battalion (APBn) have been deployed to maintain law and order, said Superintendent of Industrial Police Muminul Islam Bhuiyan.