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.
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