Fifty-five suspected illegal immigrants, including some children, were discovered in a tractor-trailer in San Antonio Tuesday night.

Authorities from several agencies were called to a North Side neighborhood around 8.30pm on Tuesday and found 55 people suspected of entering the country illegally in and around an 18-wheeler tractor-trailer.

A male driver, who has not been identified, was arrested at the scene.

Fifty-five people were found hiding in the back of a tractor-trailer in San Antonio, Texas on Tuesday

The driver of the tractor-trailer was taken into custody. Above, the people who were in the back of the truck

Five of the group were injured trying to flee the truck. They were taken to the hospital for minor injuries

Homeland Security Investigations spokeswoman Nina Pruneda confirmed that the agency is investigating.

San Antonio Fire Department chief Charles Hood says all the people appeared to be in good health.

Hood said: 'This truck was air-conditioned, thank God. This truck had water. So they were hydrated.'

Hood says five individuals were treated for minor injuries, sustained when they were getting out of the truck. They were transported to a hospital.

The rest of the group were searched, fed pizza and then taken to a detention center.

The 50 who were not injured were fed pizza and then taken to a detention center

It's unclear where the truck was coming from or where it was going

San Antonio Fire Department chief Charles Hood (pictured) says all the people appeared to be in good health

The children in the group were pre-teens and older.

An representative from the Refugee and Immigrant Center for Education and Legal Services (RAICES) went to the scene to give the group legal counsel.

'We help people seek asylum,' said Jenny Hixon, RAICES Director of Education and Outreach, according to KENS5. 'We need to be humanitarian. We need to do something that is consistent with our values. We must show dignity and respect. We don’t know where they are going. There are lots of detention centers around South Texas.'