Firemen work at the site of a blast at a building in the city of Rosario, province of Santa Fe, about 300 km near Buenos Aires, capital of Argentina, on Aug. 6, 2013. At least one was killed and 30 others injured when a boiler in an apartment building exploded in Rosario on Tuesday, the Nation daily reported on its website. (Xinhua/Alejandro Hacho)

 

Firemen work at the site of a blast at a building in the city of Rosario, province of Santa Fe, about 300 km near Buenos Aires, capital of Argentina, on Aug. 6, 2013. At least one was killed and 30 others injured when a boiler in an apartment building exploded in Rosario on Tuesday, the Nation daily reported on its website. (Xinhua/Alejandro Hacho)

 

 Firemen work at the site of a blast at a building in the city of Rosario, province of Santa Fe, about 300 km near Buenos Aires, capital of Argentina, on Aug. 6, 2013. At least one was killed and 30 others injured when a boiler in an apartment building exploded in Rosario on Tuesday, the Nation daily reported on its website. (Xinhua/TELAM)

 

Firemen work at the site of a blast at a building in the city of Rosario, province of Santa Fe, about 300 km near Buenos Aires, capital of Argentina, on Aug. 6, 2013. At least one was killed and 30 others injured when a boiler in an apartment building exploded in Rosario on Tuesday, the Nation daily reported on its website. (Xinhua/Alejandro Hacho)

 

Firemen work at the site of a blast at a building in the city of Rosario, province of Santa Fe, about 300 km near Buenos Aires, capital of Argentina, on Aug. 6, 2013. At least one was killed and 30 others injured when a boiler in an apartment building exploded in Rosario on Tuesday, the Nation daily reported on its website. (Xinhua/Alejandro Hacho)

 

A fireman works at the site of a blast at a building in the city of Rosario, province of Santa Fe, about 300 km near Buenos Aires, capital of Argentina, on Aug. 6, 2013. At least one was killed and 30 others injured when a boiler in an apartment building exploded in Rosario on Tuesday, the Nation daily reported on its website. (Xinhua/TELAM)

 

The site of a blast at a building is seen in the city of Rosario, province of Santa Fe, about 300 km near Buenos Aires, capital of Argentina, on Aug. 6, 2013. At least one was killed and 30 others injured when a boiler in an apartment building exploded in Rosario on Tuesday, the Nation daily reported on its website. (Xinhua/TELAM)

 

 Firemen work at the site of a blast at a building in the city of Rosario, province of Santa Fe, about 300 km near Buenos Aires, capital of Argentina, on Aug. 6, 2013. At least one was killed and 30 others injured when a boiler in an apartment building exploded in Rosario on Tuesday, the Nation daily reported on its website. (Xinhua/TELAM)

 

The site of a blast at a building is seen in the city of Rosario, province of Santa Fe, about 300 km near Buenos Aires, capital of Argentina, on Aug. 6, 2013. At least one was killed and 30 others injured when a boiler in an apartment building exploded in Rosario on Tuesday, the Nation daily reported on its website. (Xinhua/Alejandro Hacho)

 

 Firemen work in the place of an explosion in a building in Rosario city, around 300 km away from Buenos Aires city, capital of Argentina, on Aug. 6, 2013. The explosion that happened on Tuesday on a building in the Argentine city of Rosario, around 300 km away from Buenos Aires city, left at least nine dead, according to the local Healt Secretary Leonardo Caruana. (Xinhua/Jose Granata/TELAM)

 

A building burns after an explosion in Rosario city, around 300 km away from Buenos Aires city, capital of Argentina, on Aug. 6, 2013. The explosion that happened on Tuesday on a building in the Argentine city of Rosario, around 300 km away from Buenos Aires city, left at least nine dead, according to the local Healt Secretary Leonardo Caruana. (Xinhua/Jose Granata/TELAM)

 

Emergency personnels help a resident after an explosion in Rosario city, around 300 km away from Buenos Aires city, capital of Argentina, on Aug. 6, 2013. The explosion that happened on Tuesday on a building in the Argentine city of Rosario, around 300 km away from Buenos Aires city, left at least nine dead, according to the local Healt Secretary Leonardo Caruana. (Xinhua/Jose Granata/TELAM)

 

A building burns after an explosion in Rosario city, around 300 km away from Buenos Aires city, capital of Argentina, on Aug. 6, 2013. The explosion that happened on Tuesday on a building in the Argentine city of Rosario, around 300 km away from Buenos Aires city, left at least nine dead, according to the local Healt Secretary Leonardo Caruana. (Xinhua/Jose Granata/TELAM)

 

An emergency personnel helps a resident to excape from a building after an explosion in Rosario city, around 300 km away from Buenos Aires city, capital of Argentina, on Aug. 6, 2013. The explosion that happened on Tuesday on a building in the Argentine city of Rosario, around 300 km away from Buenos Aires city, left at least nine dead, according to the local Healt Secretary Leonardo Caruana. (Xinhua/Jose Granata/TELAM)

 

inside of a residence remains damaged after an explosion in Rosario city, around 300 km away from Buenos Aires city, capital of Argentina, on Aug. 6, 2013. The explosion that happened on Tuesday on a building in the Argentine city of Rosario, around 300 km away from Buenos Aires city, left at least nine dead, according to the local Healt Secretary Leonardo Caruana. (Xinhua/Jose Granata/TELAM)

 

Emergency personnels work at the remains of a building after an explosion in Rosario city, around 300 km away from Buenos Aires city, capital of Argentina, on Aug. 6, 2013. The explosion that happened on Tuesday on a building in the Argentine city of Rosario, around 300 km away from Buenos Aires city, left at least nine dead, according to the local Healt Secretary Leonardo Caruana. (Xinhua/Jose Granata/TELAM)

 

Emergency personnel help a resident to exit a building after an explosion in Rosario city, around 300 km away from Buenos Aires city, capital of Argentina, on Aug. 6, 2013. The explosion that happened on Tuesday on a building in the Argentine city of Rosario, around 300 km away from Buenos Aires city, left at least nine dead, according to the local Healt Secretary Leonardo Caruana. (Xinhua/Jose Granata/TELAM)