The hearts of Twitter users from around the world went out to the central Argentinian city of Rosario, where at least one person was killed and more than a dozen others were injured Tuesday in a gas explosion.

The blast rocked Rosario, the largest city in Argentina’s Santa Fe province and the country’s third-largest city, severely damaging a multi-story apartment complex, the Associated Press reported.

A 21-year-old woman was killed and up to 51 others were injured in the Rosario explosion, Municipal Health Secretary Leonardo Caruana told local radio, according to the AP. Caruana said three were critically injured.

The Buenos Aires Herald, an English-language news site, gave a conflicting report. The news outlet claimed the death toll has risen to six and that 58 people were injured in the Rosario explosion.

Rosario Mayor Monica Fein said 17 ambulances rushed to the scene of the blast and that authorities ordered nearby buildings to be evacuated. A group with Argentina’s federal police is also on its way to Rosario, according to the Herald.

According to the AP, dozens of people were trapped on the upper floors of the apartment building. Firefighters were seen rescuing some of the residents. It took firefighters about three hours to extinguish the blaze.

Natural gas lines were cut off to the building. The local gas company, Litoral Gas, also decided to shut gas lines in the immediate vicinity of the explosion. The incident also led to the evacuation of 11 nearby schools, shops and apartment buildings.

The explosion trended worldwide Tuesday on Twitter, where the hashtag #ExplosionEnRosario went viral.

One Twitter user, Joana Garcia, was worried about whether her friends survived the blast.

“Still looking for my friends! They can’t be found at any hospital! Please pray :'(,” Garcia wrote.

Here were some others users’ thoughts on the explosion:

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