Hundreds of people have surrounded Mexico's stock market building as part of a series of protests over alleged fraud in recent presidential elections.
Supporters of leftist candidate Andres Manuel Lopez Obrador marched to the building in Mexico City Thursday, blocking some employees from entering. Officials said exchange operations were unaffected.
The march started hours after Lopez Obrador said no new protests were planned for two or three days.
Thousands of his supporters have been camped out on Mexico City's Reforma Avenue since Sunday, causing major traffic blockages.
Lopez Obrador has said the street protest will continue until all ballots from the July 2 vote are recounted.
Lopez Obrador narrowly lost to conservative candidate Felipe Calderon.
The nation's top electoral court is hearing complaints about the vote. It has until September 6 to rule on Lopez Obrador's challenge and officially announce the winner of the election.
Some information for this report was provided by AP and Reuters.