A thunderous gas explosion devastated a rowhouse neighborhood in Allentown, Pa., killing five people, and suspicion fell on an 83-year-old cast-iron gas main. The fiery blast was the latest natural-gas disaster to raise questions about the safety of the nation's aging, 2.5 million-mile network of gas and liquid pipelines.
The explosion, which flattened a pair of rowhouses and set fire to a block of homes late Wednesday night, occurred in an area where the underground gas main lacked shut-
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