Is this Fifa's biggest crisis?

Two criminal investigations into corruption at football's world governing body Fifa are under way, with seven senior officials arrested in Zurich on US charges.

Separately, Swiss prosecutors have launched a criminal case into the bids for the 2018 and 2022 world cups, to be held in Russia and Qatar respectively.

Fifa says it plans to go ahead with elections for president on Friday. Incumbent president Sepp Blatter, who is seeking a fifth term, was not one of the seven high-ranking officials arrested.

Richard Conway reports.