At least 152 tolas of gold ornaments worth around Tk 80 lakh were stolen from a jewellery shop in the city's Katpatty Road adjacent to Kotwali Police Station early hours Thursday.
Satyajit Karmakar, owner of the shop Badhuya Jewellery, said miscreants broke the locks on the collapsible gate to enter and looted the gold by breaking open an iron safe.
He closed his shop around 10:30pm on Wednesday and found the shop ransacked on Thursday morning, he added.
Police detained night guards Matin and Mofazzal for interrogation, said Shaheduzzaman, officer-in-charge of Kotwali Police Station.