The suspected driver of a truck where 53 migrants died from heat in Texas did not know that the air conditioner had stopped working, court documents say.

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Homero Zamorano, 45, was found hiding near the truck on Monday, officials say. He is one of four people charged.

Mr Zamorano and alleged conspirator Christian Martínez, 28, are accused of sending text messages to each other before and after the truck was found.

It is the deadliest human trafficking incident in US history.

Several children found in the vehicle are still being treated in hospital. The victims were from Mexico, Honduras, El Salvador and Guatemala.

Mr Zamorano was found hiding in bushes. Mexican officials say he initially tried to pass himself off as one of the survivors.

He was arrested when surveillance photos showed him driving the truck past a US Border Patrol checkpoint in Laredo, Texas.

According to federal court documents, a confidential government informant working for Immigration and Customs Enforcement and Texas police told officials that Mr Zamorano and Mr Martínez had spoken after the deaths were reported.

Mr Martínez allegedly said: "The driver was unaware the air conditioning unit stopped working and was the reason why the individuals died."

The documents add that the informant and Mr Martínez were standing within several metres of each other when the conversation took place.