International Monetary Fund chief Christine Lagarde has said the decision to formally investigate her over negligence claims was "without basis".
In a statement after a fourth round of questioning before magistrates, Lagarde said she was returning to work in Washington later in the day.
"After three years of proceedings, dozens of hours of questioning, the court found from the evidence that I committed no offence, and the only allegation is that I was not sufficiently vigilant," Lagarde said.
More top news
Emergency services rushed to the scene to douse the flames, but there were no immediate reports of casualties.
A motion to remove John Bercow from his position as Speaker of the House of Commons is struggling to find support.
Familial hypercholesterolaemia causes abnormally high levels of cholesterol, increasing the risk of a heart attack at a young age.