Hackers have stolen sensitive Mexican files, including previously undisclosed information that President Andres Manuel Lopez Obrador was taken to hospital in an ambulance with a heart problem in January, the government said on Friday.

“It’s true, there was a cyber attack,” Lopez Obrador said at his daily press conference.

“I understand that the same group has already done the same thing in other countries,” he added.

On Thursday, prominent journalist Carlos Loret de Mola reported that a hacking group called Guacamaya received tens of thousands of emails from the Defense Department dating from 2016 to September 2022.

The files revealed that Lopez Obrador, 68, was taken by ambulance from his ranch in Palenque in the southern state of Chiapas on Jan. 2 to be treated at a military hospital in Mexico City, Loret de Mola said.

“Everything that is said there is true,” Lopez Obrador, who suffered a heart attack in 2013, told reporters.

“The ambulance that went to Palenque in early January was because of a risk of a heart attack and they took me to the hospital and recommended catheterization,” he said.

The government reported more than two weeks later that Lopez Obrador underwent a cardiac catheterization procedure at a routine check-up on January 21 and was in “perfect health.”

“Following this procedure, the President’s heart and arteries were found to be healthy and functioning properly,” the Home Office said.

“No other type of intervention was necessary and it was a short procedure, lasting around 30 minutes,” the statement added.

On January 10, Lopez Obrador announced he had contracted Covid-19 for the second time and said he had mild symptoms and would isolate himself until he recovered.

A week later, he said he had beaten the coronavirus for a second time after a first battle a year earlier.