Millions of women gathered in Washington and cities around the country and the world Saturday to mount a roaring rejoinder to the inauguration of President Donald Trump. What started as a Facebook post by a Hawaii retiree became a historic international rebuke of new president that packed cities large and small — from London to Los Angeles, Paris to Park City, Utah, Miami to Melbourne, Australia.

In Chicago, the demonstration was overwhelmed by its own size, forcing officials to curtail its planned march when the crowd threatened to swamp the planned route.

The Washington organizers, who originally sought a permit for a gathering of 200,000, said Saturday that as many as a half million people participated.