Federal agents arrested 81 people over a few hours hours this weekend in Charlotte, North Carolina, the next city for President Donald Trump's crackdown on immigration, according to a US Customs and Border Patrol official.

Greg Bovino, a border official, said the dozens of people were arrested in Charlotte in just five hours on Saturday.

The Department of Homeland Security (DHS) also said a US citizen allegedly injured an officer there by ramming a law enforcement vehicle with their car.

By population, Charlotte is roughly a quarter of the size of Los Angeles and a third of Chicago, the two most notable places targeted for immigration sweeps and deportations.

Bovino, who is known for leading the Chicago immigration effort until recently, posted on social media that "Operation Charlotte's Web" had removed many people from the streets who had a "significant criminal and immigration history".