Grad student sues over false arrestPITTSBURGH — A man whose alibi checked out after he was arrested for assaulting a pregnant woman in Pittsburgh is suing the city.Rex Coughenour, 62, filed a federal lawsuit Tuesday for false arrest, false imprisonment and malicious prosecution.The lawsuit says the Duquesne University graduate student stopped at a convenience store before walking home after a night of studying. He alleges he ran into an officer who was investigating an assault and was arrested after the victim identified him without checking his claim that he had been in the university library.The man spent a month behind bars before he was assigned a public defender, who obtained surveillance video from the store confirming his alibi.

Report: Corrosion led to pipeline blastGREENSBURG — Faster-than-expected corrosion caused a natural gas pipeline blast that scorched 40 rural acres in April and badly burned a man whose home was destroyed, the Texas energy company that owns the pipeline said.Andy Drake, the vice president of operations and environmental health and safety with Houston-based Spectra Energy, shared those findings Tuesday night in Salem Township, Westmoreland County. The 30-inch pipeline burst there April 29.The pipeline showed some corrosion during a 2012 inspection but not enough to warrant action until 2019. That’s because officials anticipated corrosion would grow 2 percent to 3 percent annually. Instead, the line corrosion increased about five times faster, or 10 percent to 15 percent each year, said Drake, who apologized for the failure.