( CNN ) -- Leaking gas was likely to blame for an explosion that killed at least 12 people , injured 60 more and brought down part of a building in Argentina on Tuesday , state media reported Wednesday . A man who was working at the scene in the city of Rosario before the blast ignited at 9:15 a.m. local time has been taken into custody , said the Telam news agency , which cited investigator Juan Curto . The explosion gutted one multi-story residential building , and destroyed at least one other building next to it , while blowing out the windows of surrounding structures , images broadcast by CNN affiliate Canal 9 showed . A swath of white smoke and dust dominated the skyline of the city , located about 200 miles northwest of the capital , Buenos Aires . Firefighters swung extended ladders around to upper balconies and windows to rescue residents stranded on top floors . Rubble and shards of glass filled the streets below , as fire engines arrived Tuesday to douse the blaze , and medical teams tended to bleeding victims . Rescuers are still searching for over a dozen people who were in the residential building at the time of the blast , local newspaper Clarin reported . CNN 's Ben Brumfield wrote in Atlanta .
Leaking gas is likely to blame , authorities say . A man working at the site in Canal 9 before the blast ignited is taken into custody . A swath of white smoke hangs over the city , located about 200 miles from CNN . Rescuers are searching for 60 missing people , local newspaper Clarin reports .