Three men have been arrested in north and east Belfast as part of what police call a "complex and challenging investigation" into cheque fraud.
The men, two aged 24 and one aged 25, were detained on Friday on suspicion of a number of offences including theft, fraud and handling stolen goods.
It came after detectives from Downpatrick carried out eight searches in Belfast.
The investigation started last month after police received a report from a company based in the Sainfield area that company cheques were being used without their knowledge of approval.
Detective Sergeant James Johnston said: "An investigation was immediately started, with our enquiries leading us to eight searches being carried out and the arrest of three men in north and east Belfast on Friday 8th September. The men, two aged 24 and one aged 25, were arrested on suspicion of a number of offences including theft, fraud and handling stolen goods.
"All three men have since been released on police bail as our enquiries into the matter continue."