U.S. business leaders are calling for calm following Tuesday’s election even as they brace for potential trouble on the streets and inside their companies in case of a disputed result.

The fears were highlighted in many US cities where retail stores were being boarded up, as some key executives expressed concerns about public reaction.

Facebook chief Mark Zuckerberg last week warned of the potential for civil unrest as votes are tallied in a U.S. election that will be “a test” for the social network.

Zuckerberg expressed his concern recently while describing safeguards against misinformation and voter suppression at the leading social network that are intended to avoid the kinds of deception and abuse that played out four years ago.

Read more at NEWSMAX.