Robbery took place at Aadi Fashion factory in Udyog Kendra area under Bisrakh police station.
"Manhunt has been launched to trace the robbers," a senior police officer said.
"Today at 1 a m around 25 armed robbers gained entry into the factory and at gun point overpowered two security guards and two other employees working at the factory .
"Thereafter they robbed over 6 tonnes of metal slabs of silver, zinc, brass and copper. They had brought a truck with them," factory owner Nitesh Jain, told PTI today.