AP

Three powerful accidents in recent years highlight weaknesses in the oversight of how natural gas providers maintain the largest pipelines in their networks, accident investigators said Tuesday as they issued more than two dozen safety recommendations.

A major effort a decade ago by the federal government to check a rise in violent pipeline failures in "high-consequence" areas where people are more likely to be hurt or buildings destroyed has resulted in a slight leveling off of such incidents, but no decline, the National Transportation Safety Board said.

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