'I heard this loud boom and the building shook' A contractor boring under a sidewalk hit a 2-inch gas line, triggering a deadly gas explosion, authorities said. 'I saw the smoke billowing up' »

'I heard this loud boom and the building shook' A contractor boring under a sidewalk hit a 2-inch gas line, triggering a deadly gas explosion, authorities said. 'I saw the smoke billowing up' »