One of six men charged in Texas over 53 migrants who died last year in a sweltering tractor-trailer has pleaded guilty to smuggling-related charges.

Two men have been indicted in connection with a human smuggling attempt that left 53 people dead and 11 injured inside a hot tractor trailer in Texas.

Two men have been indicted in the case of a tractor-trailer rig found with 53 dead or dying migrants inside in San Antonio.