LOS ANGELES (AP) — Federal authorities on Thursday slapped new financial reporting rules on 2,000 businesses in the Fashion District of Los Angeles in an effort to curtail suspected Mexican and Colombian drug money laundering after massive amounts of cash were seized in a raid.

The Treasury Department’s Financial Crimes Enforcement Network issued an order requiring the businesses to report any transaction involving more than $3,000 in cash. The geographic targeting order — a tool used to track and deter money laundering — is one of the largest ever issued, said Jennifer Shasky Calvery, the network’s director.