article_snippet: The aircraft collided while flying near Villa Castelli in La Rioja province in Argentina in La Rioja province, about 720 miles northwest of Buenos Aires, La Rioja Secretary of Security Cesar Angulo told television station TN.
article_snippet: The eight passengers on board had been divided into two teams of four .
article_snippet: People gather near the smoking remains of a helicopter that crashed with another near Villa Castelli in the La Rioja province of Argentina on Monday . '
article_snippet: An explosion occurred and An explosion's believed that they must have collided,' said Security Cesar Angulo.
article_snippet: Aeronautical experts will have to determine that.'
article_snippet: One of Two helicoptersbelonged to Rioja while the second belonged to the neighboring province of Santiago del Setero, Security Cesar Angulo said.
article_snippet: People walk around the wreckage of An explosion on Monday. 
article_snippet: It is believed, however, that the pilots are from Rioja and neighboring province Santiago del Setero .
highlights_snippet: Crash happened near Villa Castelli in La .
  