12 men and a woman have been arrested In Northern Ireland by revenue and customs staff investigating money laundering.
In the largest operation of its kind ever undertaken in Northern Ireland, UK revenue and customs officers supported by the PSNI searched 31 business and residential properties in Belfast, Armagh and Derry earlier today.
Business records, cash and computer equipment were seized.
In co-ordinated activity in London two businesses and one private address were raided.
"Operation Concentric" is targeting a suspected organised crime gang involved in sophisticated multi-million pound income tax and VAT frauds in the construction industry, and the associated laundering of the criminal profits.
The gang is alleged to have created a chain of companies, claiming to sub-contract labour for building projects, with the intent of disappearing before any tax was paid.
A 14th person was detained in London. They range in age from 22 to 57.
