WASHINGTON, 20 September 2021, (TON): The United States has started flying migrants out of a Texas border town that has seen an influx of mostly Haitian migrants over the past week.

Three flights landed at Haiti's Port-au-Prince airport, each carrying 145 people, the Associated Press reports.

About 13,000 would-be immigrants have gathered under a bridge connecting Del Rio in Texas to Mexico's Ciudad Acuña.

They have been waiting in a makeshift camp in temperatures of 37C (99F).

An emergency US public health order known as Title 42 allows authorities to expel most migrants before they can claim asylum.

Local officials have struggled to provide those in Del Rio with food and adequate sanitation.

Tom Cartwright, of the advocacy group Witness at the Border, who tracks US Immigration and Customs Enforcement (ICE) flights, told Reuters three flights left Texas - one from Laredo and two from San Antonio - on Sunday carrying Haitians back to Haiti.

Haitian migrants gather in Port-au-Prince after getting off a plane from Texas.

Border Patrol Chief Raul L. Ortiz said 3,300 migrants had been moved from the camp to planes or detention centres.