LONDON - 10:34 GMT - Qatar - Qatar has strongly denied any wrongdoing linked to its bid. But a former FIFA vice president from the Gulf state was banned for life from FIFA because of corruption.
FIFA spokesman Walter De Gregorio arrives to give a press conference at FIFA headquarters in Zurich
A former US attorney, Michael Garcia, investigated the World Cup bids. He left FIFA because it refused to fully publish his report.
Prince Ali bin al Hussein of Jordan, a FIFA vice president, is standing against Blatter in Friday's election. He called Wednesday's arrests a "sad day" for football.
He and European federation chiefs say a change of leadership is now urgently needed to save FIFA's tainted image.
10:33 GMT - Corruption storms - Blatter, who has led FIFA since 1998, has continually had to steer the multi-billion dollar world body through corruption storms.
The latest has been over the award of the 2018 and 2022 World Cups to Russia and Qatar.
10:30 GMT - 'Kick-backs' - The Swiss justice ministry said only that six football officials had been detained following a request from the US Attorney's Office for the Eastern District of New York.
It said they were suspected of accepting "bribes and kick-backs between the early 1990s and the present day."
10:29 GMT - Room keys - Swiss police in plain clothes took the room keys from the reception at the Baur au Lac hotel in Zurich and went to the rooms of the six football officials, the New York Times said.
The operation was carried out peacefully, it added.
10:26 GMT - 'Two generations' - "It spans at least two generations of soccer officials who, as alleged, have abused their positions of trust to acquire millions of dollars in bribes and kickbacks," Attorney General Loretta Lynch said in the Justice Department statement about the charges.
10:26 GMT - US indictment - The US Justice Department has unsealed an indictment against nine FIFA officials and five executives, charging them with conspiracy and corruption over a 24-year span.
The Department of Justice said it unsealed the indictment as officials raided the CONCACAF soccer organisation headquarters in Miami as part of the case.
- Indictment -
10:23 GMT - Vote - The spokesman says the FIFA vote for a president for the next four years will go ahead as planned in Zurich on Friday.
10:23 GMT - Blatter 'not involved' - FIFA president Sepp Blatter and its general secretary Jerome Valcke are not implicated in a corruption probe, the organisation's spokesman says.
"The general secretary and the president are not involved in this," spokesman Walter De Gregoria told a hastily arranged press conference.
10:22 GMT - Investigation - The raids were part of an investigation already under way into money laundering and fraud involving FIFA's awarding of the 2018 and 2022 World Cups to Russia and Qatar respectively, a statement said
Jeffrey Webb, a vice president of FIFA, was among those detained in the dawn police raid, according to the New York Times.
10:18 GMT - WELCOME TO AFP'S LIVE REPORT on the drama unfolding after Swiss police staged a dawn raid on a Zurich hotel and detained six top football officials as part of a US investigation into tens of millions of dollars of bribes.
All six could be extradited to the United States, with the shock arrests coming only two days before FIFA president Sepp Blatter seeks reelection as head of football's world governing body in a campaign overshadowed by scandal.
Swiss police also raided the FIFA headquarters in Zurich, seizing documents and data.