Hundreds of Central and South American migrants, including children, were rescued by Mexican authorities from two trailers in separate incidents over just 12 hours.

Law-enforcement in the northern state of Nuevo Leon were shocked Wednesday night when they found 119 migrants inside an abandoned trailer on the side of a highway connecting the city of Monterrey to the border town of Reynosa just hours from the U.S. border crossing.

Officials said 81 adults and 38 children were found in the trailer at about 10pm local time, and received medical attention.

A driver abandoned a trailer carrying 119 immigrants late Wednesday night before reaching a checkpoint station hours from the U.S border

Paramedics tend to a migrant (right) that was transported to a hospital after Mexican law-enforcement agents rescued 119 migrants stuck inside a trailer headed for the U.S. border

A paramedic offers aid to a girl who was among the 119 undocumented migrants who were abandoned and saved from a trailer in Mexico

Two pregnant women, including one who was transported to a hospital, were also part of the traveling group that attempted to cross the border.

According to Publi Metro, the driver of the truck identified as Miguel N, 42, was arrested and accused of human trafficking.

Miguel stopped the trailer carrying foreign nationals from El Salvador, Honduras and Guatemala ahead of a routine inspection site set up at a station housing federal, state and local authorities in the municipality of Bravo.

After he stopped the trailer, the agents heard people crying, screaming and pounding the doors before they were able to pry it open and lead them to safety.

A few of the migrants managed to run off and evade capture. The driver tried fleeing but was quickly apprehended.

'[They were] in deplorable conditions. It was tremendously overcrowded,' State Security Secretary Bernardo Gonzalez told Univision.

'Some said they had spent more than two or three days in the semi-trailer box which barely had oxygen.'

A team of Mexican federal, state and local agents saved the lives of 218 migrants, including 102 minors, who were inside a trailer heading for the United States border Thursday morning

A woman, who perhaps is the parent of the two children sitting on the ground, is attended by a Mexican agent during Thursday morning's rescue

The government of state of Nuevo Leon was quick in helping the 218 migrants who were found inside a trailer that was bound from northern Mexico to the U.S. border Thursday

On Thursday morning, a joint rescue mission between various law-enforcement agencies freed 218 undocumented migrants, including 102 children, inside a separate trailer traveling along a highway from Reynosa to General Bravo in the state of Nuevo Leon.

The truck transporting immigrants from Guatemala, Nicaragua, El Salvador and Honduras that was also bound for the U.S border.

'Some kids and fathers and mothers fainted since there was no water,' said one of the migrants who was hoping to cross the border into Texas.