US election officials concerned by threats and protesters

A Trump supporter argues with counter protesters while Trump supporters demonstrate against the election results outside the central counting board in Detroit on Thursday Picture: David Goldman/AP

Election officials in several US states have expressed fears about the safety of their workers amid a stream of threats and gatherings of angry protesters outside their doors, spurred by Donald Trump’s claims of a corrupt election.

Groups of Trump supporters have gathered at vote tabulation sites in Phoenix, Detroit and Philadelphia, decrying counts that showed Democrat Joe Biden leading or gaining ground.