Black Americans are receiving mass text messages telling them to 'pick cotton' following Donald Trump's victory.

The texts threaten recipients with being kidnapped and forced to pick cotton, and are signed off by someone claiming to be a Trump supporter.

The messages have been reported to authorities and posted on social media, with recipients including students and individuals across the country.

Civil rights groups and hate watchdogs have condemned the texts, and state and local law enforcement teams are investigating the matter.

The Virginia Attorney General's Office has condemned the messages and advised those who feel threatened to contact local law enforcement or the FBI.