Two trains crashed south of the Spanish capital Madrid on Wednesday morning, on the high-speed line to Seville.

At least 68 people died in the collision, when a state-operated Renfe train went into the back of a stationary train operated by the Iryo company near the town of Urda.

So far at least 68 people are confirmed to have died in the incident.

The crash happened at 08:53 (07:53 GMT) between municipalities Mora and Orgaz, and about 140km (100 miles) south of Madrid, according to an account given by the Spanish government.

The privately run Iryo train appears to have been stationary on the state-run Renfe train barrelled into the back of it at high speed. Iryo said its train was "struck from behind" by a Renfe train "due to causes that are still unknown".

The crash caused some carriages to fall down an embankment.

All train traffic on the line was stopped at stations along the route.

Renfe said services between Madrid, Ciudad Real and Andalusia were suspended.

A passenger on board one of the trains told local media there was a heavy impact about 40 minutes into the journey.

Transport minister Óscar Puente said a computer failure at about 08:30 on Wednesday morning led to the initial halt of six moving trains, including the two trains that subsequently collided.

"In the event of a system failure, the control centre takes over," he said, adding it was the control centre that decided to allow the trains to move again, without any speed restrictions.

That decision, Puente said, was made "under inexplicable circumstances". It resulted in the Renfe train crashing into the Iryo train, which was stationary on the tracks some distance ahead.

Audio recordings obtained by Spanish media between train controllers working in Madrid for a rail infrastructure company in Adif in Madrid and the train drivers appear to show that one high-speed train was given clearance to move at 08:36 even though another some 25km ahead had stalled.

In one recording, the controller tells the driver of the Renfe train to disconnect and reconnect the LZB mechanism that monitors train speeds, and then resume the journey at normal speed.

"Disconnect and reconnect LZB. Continue your journey and then proceed under [Lateral Signalling Block], at normal speed with normal operation," the control centre operator says to the driver.

The driver replies, "At normal speed?" To which the controller says: "Yes."

Under normal protocols, the driver would be expected to continue moving at a maximum of 40km/h according to their line of sight, and not at normal speed on a track designed for speeds of up to 200km/h.

The Lateral Signaling Block is a back-up or alternative train system used when the automatic signalling or data transmission system fails.

In a second audio recording between the driver of the Iryo train in front and the control centre, the driver says the train "is stationary in front of the entry signal at Urda". After some exchanges, the control centre operator tells the driver to "resume the journey" normally.

The Iryo driver then contacts the control centre again, according to a later recording, saying they cannot start the train. "The train won't allow me to control the [security] system. That's why I am still stopped in front of the entry signal," they say.

The latter recording suggests that the controller had been notified that the Iryo train remained stationary as the Renfe train approached.

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Esther Padilla, spokesperson for the government of Castilla-La Mancha region, told TVE that one of the trains - managed by the Iryo company - was carrying 146 passengers plus one baby, while the Renfe-managed train had 397 passengers on board.

A former government minister was also among those reported missing.

The Spanish Confederation of Business Organizations (CEOE) posted on X that, Fátima Báñez - who heads the organization's foundation - was on board one of the trains involved in the crash.

Eighty people were treated for injuries, according to Spanish authorities, with 50 of the casualties said to be in a serious condition, and 15 more in a critical condition.

Spanish Prime Minister Pedro Sánchez has said "the whole of Spain is grieving" and that "lives have been shattered, families have been torn apart".

"The pain is immense," he said on a visit to the crash site.

The government was "trying to determine what was the origin of this tragedy, of this terrible accident," he added.

"We will get to the bottom of this, and if there has been any negligence, it will come to light.

"If there have been failures in the security system, they will be addressed with the utmost firmness."

Opposition conservative leader Alberto Núñez Feijóo, whose People's Party leads most opinion polls ahead of 29 November elections, said it was not the day to talk about political responsibility, but insisted "Spain has the right to know what is going on with its infrastructure".

Most Spanish politicians cancelled all public engagements on Wednesday and suspended their election campaign.

However, Santiago Abascal of the far-right Vox refused to take part in what his party described as attempts to "use mourning to silence criticism" of the country's rail infrastructure.

Spain's royal family posted on X that it was "shocked and concerned" and expressed condolences for the relatives of the deceased and those affected by the crash.

A spokesperson for the EU said the bloc was ready to help Spain if needed.

A huge emergency response was under way with fire crews and helicopters at the scene.

Hospitals in the area suspended planned surgeries as they deal with an influx of patients from the crash, Spanish media have reported.

A blood transfusion centre in Madrid appealed for "urgent" donations. In a post on X, Centro de Transfusión said it made the request "in the face of a possible sudden increase in care needs".

It reported that facilities in Toledo, Ciudad Real and Alcázar de San Juan had cancelled procedures as casualties from the crash begin to arrive.

The Spanish Civil Guard set up bureaus in Madrid, Toledo, Seville and Córdoba to investigate reports of missing persons.

"The top priority is the identification of the missing persons and the taking of DNA samples to be able to locate their relatives," the civil guard wrote in a post on X.

This is the second high-speed rail tragedy in Spain this year.

In January a high-speed train derailed in southern Spain, its rear carriages going into the path of a state-run Renfe train, claiming the lives of 46 people.

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