KATHMANDU: Police said they seized two mini-trucks involved in illegally ferrying sand from Jadibuti Chok, KMC-35, on Friday. Metropolitan Police Sector Koteshwor took the loaded vehicles in custody after finding out that they were operating without valid documents.Drivers of both the vehicles (Ba 2 Kha 8937 and Ba 2 Kha 8065) are at large, police said. Police said they are looking into the case.