FBI officials have raided the Miami headquarters of Concacaf, the footballing body of North America, Central America and the Caribbean, as part of a probe into Fifa corruption by US authorities.
Officials from both the FBI and the IRS, America's internal revenue service, retrieved from the building several boxes of documents as well as computer equipment.
The move comes a day after Swiss authorities, at the request of the US Department of Justice, arrested seven Fifa officials at the hotel where they were staying in Zurich, Switzerland.
They are under investigation by the FBI over corruption involving Fifa officials accepting more than $150m (£98m) of bribes from sports broadcast and marketing executives dating back 24 years. So far nine football officials and five sports media and promotions executives face corruption charges, according to US authorities.
A separate criminal investigation by Swiss authorities into how the 2018 and 2022 World Cups were allocated to Russia and Qatar has also begun.
Fifa sponsors have expressed their dismay over the corruption probe, whilst Uefa, Europe's footballing body, has called for there to be a postponement of the Fifa presidential elections on 29 May.
But Fifa president Sepp Blatter has insisted that presidential elections will still go ahead, in which he was widely expected to beat Prince Ali bin al-Hussein of Jordan and secure a fifth term as president.