New York emergency responders search through the rubble at the site of the building explosion. (Brendan McDermid/Reuters)

The National Transportation Safety Board said Tuesday that they had found a leak in a gas main “adjacent to” one of the buildings destroyed in an explosion in Harlem last week.

Investigators found the leak in an eight-inch cast iron and plastic main on Park Avenue between 116th and 117th streets. The leak was found near 1646 Park Avenue, one of the two destroyed buildings. Segments of this gas main and other service lines in the vicinity will be shipped to the NTSB’s lab in Washington to be examined and tested, as will part of the cracked water main pipe in front of one of the buildings.

The explosion on March 12 leveled two residential buildings, killing eight people and injuring dozens more.