Bomb threats across multiple swing states as Donald Trump makes unfounded claims

An election worker scans an envelope that holds a voting machine memory card at the Fulton County Election Hub and Operation Centre in Atlanta, Georgia (AP Photo/John Bazemore)

A mostly smooth Election Day across the US has been marred in multiple battleground states by a series of bomb threats and baseless claims of wrongdoing by former president Donald Trump.

The bomb threats in parts of Arizona, Georgia and Pennsylvania turned out to be hoaxes, but forced evacuations and some polling places to extend hours.