local time has been taken into custody , said the Telam news agency , which cited investigator Juan Curto . Leaking gas is likely to blame , authorities say . A man working at the site in Rosario before the blast ignited is taken into custody . A swath of white smoke hangs over the city , located about 200 miles from Buenos Aires . - The U.S. Geological Survey says a magnitude 6.3 earthquake struck off Argentina's southern coast on Tuesday morning.
Leaking gas is likely to blame , authorities say . A man working at the site in Rosario before the blast ignited is taken into custody . A swath of white smoke hangs over the city , located about 200 miles from Buenos Aires . - The U.S. Geological Survey says a magnitude 6.3 earthquake struck off Argentina's southern coast on Tuesday morning.