NTSB member Robert Sumwalt speaks to the media at the site of a building explosion in the Harlem section of New York, March 13, 2014. REUTERS/Eduardo Munoz
NEW YORK (Reuters) - Federal safety authorities launched an investigation on Thursday into a gas explosion that caused the collapse a day earlier of two New York City apartment buildings, killing seven people and injuring dozens of others.
The still-smouldering rubble prevented investigators from getting close enough to examine the main pipe that supplies natural gas to the Upper East Side neighbourhood, said Robert Sumwalt, a member of the National Transportation Safety Board, which reviews accidents involving natural gas.
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