Detectives from Organised Crime Branch have arrested two men as part of an ongoing investigation into money laundering and insurance fraud.
One of the men was arrested in Londonderry and questioned locally.
A PSNI spokesman said the arrests were part of a probe that has seen more than 25 arrests since May.
He said: “The men aged 33 and 39 were arrested in the Londonderry area and in Belfast, and are being questioned at local police stations.
“This brings to 27 the number of suspects who have been arrested and questioned since May as part of an investigation which is expected to continue for some time.
“The 25 suspects previously arrested are all on police bail pending the completion of enquiries in this investigation.”