Democrat Joe Biden moved closer to victory in the U.S. presidential race on Thursday as election officials tallied votes in the handful of states that will determine the outcome and protesters took to the streets.

Incumbent President Donald Trump alleged fraud, filed lawsuits and called for recounts in a race yet to be decided two days after polls closed.

With tensions rising, about 200 of Trump's supporters, some armed with rifles and handguns, gathered outside an election office in Phoenix, Arizona, following unsubstantiated rumors that votes were not being counted.