Fourteen people have been indited by the US authorities in connection with Fifa corruption. Six current Fifa officials (including two vice presidents), three other senior football officials and five corporate executives.
Two investigations are currently taking place. The first by US authorities relating to bribes totalling more than $100m dating back to 1991. The other by Swiss authorities into criminal mismanagement and money laundering in connection with the allocation of the 2018 and 2022 World Cups.
The Russia and Qatar World Cups will still go ahead as planned, a Fifa official confirmed on Wednesday morning.
None of the Fifa members arrested have been suspended by the governing body.
Fifa presidential elections will still go ahead as planned on Friday. President Sepp Blatter is widely expected to win a fifth term in office.
Blatter is said to be "relaxed" about the investigations.