According to police, four people were killed in a fiery wreck which occurred Thursday night on a bridge that extends the U.S Mexico border.

The accident on the 3.2-mile Pharr-Reynosa International Bridge in South Texas affected two tractor trailers and three other cars, according to the sayings of police Lt. Lupe Salinas.

He said that the accident occurred just after 7 p.m. and that the tractor trailers were coming from different directions, the Associated Press reports.

According to Salinas, three people lost their lives after their vehicle has fallen from the bridge and dropped on the other road.

Due to the collision with a tractor trailer another person has died.

Rescuers were searching for other possible victims. Salinas said that the cause of the accident was still being investigated.

The fire was put out, according to Pharr Emergency Management Coordinator Elsa Sanchez, Houston Chronicle informs.

She said that personnel from the cities nearby responded to the call.

It seemed like there were other injuries too, but none of it was life-threatening.

The victims were yet not identified by the police. There was no information regarding their genders, ages or nationalities.

The vehicle that plunged from the bridge was a pickup truck bearing a Texas license plate.

Salinas said that the tractor trailers and the other vehicle, a minivan, had Mexican license plates.

He said: "Right now we're trying to clean up the debris that we have on the bridge, investigate the accident, reconstruct the accident and recover the bodies."

According to spokesman Felix Garza for the U.S. Customs and Border Protection, the bridge was closed in both ways. Also crossers were being diverted.

Normally the bridge is closed between midnight and 6 a.m. The bridge will be reopened on Friday at 6 a.m.

The structure of the bridge didn’t suffer any damage from the accident, according to the sayings of assistant bridge director, Fred Brouwen.

This bridge is the fourth-largest commercial vehicle in Texas. Every day about 1,700 trucks and 7,000 cars cross it from Mexico to Texas, according to Brouwen.

He said: "This is basically the second accident in the 15 years we've had the bridge."

The bridge has one southbound lane and three northbound lanes.