The joint forces last night raided the office of Coco Navigations, owned by former prime minister Khaleda Zia's youngest son Arafat Rahman and Tarique RahmanÂ’s business partner Giasuddin Al Mamun, at Banani and seized some documents. The forces also raided the office of detained BNP leader Salahuddin Quader Chowdhury in the same area. Sources said the joint forces cordoned the area around 12 midnight and conducted the hour-long raid.