The investigation of the May 6 Spectra Energy Corp natural gas pipeline explosion in Westmoreland County is still ongoing by the federal Pipeline and Hazardous Materials Safety Administration.

Preliminary reports said there may have been a possible flaw in the coating material applied to a pair of welded joints that resulted in corrosion.

NewsClips:

Allegheny Front: Pipeline Explosion Stokes Worries About Safety

AP: Possibly Flawed Welds Cited In PA Pipeline Blast

PA Pipeline Explosion: Evidence Of Corrosion Found

Report: Corrosion May Be A Factor In Pipeline Explosion

Corrosion Found On Texas Eastern Pipeline That Exploded

Some Displaced By Westmoreland Pipeline Blast Cleared To Return

6 Of 9 Families Return After Natural Gas Pipeline Explosion

Pipeline Blast Victim Upgraded From Critical To Fair

Residents, Gas Firm Shift Focus To Recovery After Pipeline Explosion

AP: Pipelines Drained, Feds Investigating Cause Of Explosion

No Cause Found Yet In Westmoreland Gas Explosion

Answers Elusive In Westmoreland Pipeline Explosion

Highway Damaged By Pipeline Blast Still Being Fixed

Crable: Natural Gas Pipeline That Exploded Runs Thru Lancaster

Atlantic Sunrise Pipeline Gets FERC Green Light

FERC OKs Gas Pipeline To Serve New Shamokin Dam Power Plant

NJ Landowners Sue To Stop PennEast Pipeline Surveyors

5/9/2016