SAN ANTONIO – Forty-six people were found dead inside a tractor-trailer on the Southwest Side, and 16 others were taken to area hospitals in varying conditions, according to multiple law enforcement sources and the Archbishop of San Antonio.

Several San Antonio police vehicles, as well as fire trucks and ambulances, are covering a portion of Quintana Road on the Southwest Side. U.S. Border Patrol officers were seen arriving around 8 p.m. Monday.

Crews are surrounding an 18-wheeler near the 9600 block of Quintana Road next to railroad tracks.

A KSAT crew has seen several ambulances leaving and going into the scene.

Antonio Fernandez, CEO of Catholic Charities, said they are working to help survivors. However, he said they are not aware how many people they will be helping.

He said the Archbishop is devastated after hearing the news.

KSAT meteorologists said the high temperature reached 101 degrees before going down at 2 p.m. on Monday once the rain arrived.

We are working to gather more information. KSAT will update you as more information becomes available.