PITTSBURGH — A Pittsburgh hospital is investigating whether the deaths of two patients were caused by mold-related infections they may have contracted in an intensive care unit.

UPMC Presbyterian said this week that the cardiothoracic intensive care unit was closed Sept. 3 for an environmental cleanup after mold was discovered. Eighteen patients were relocated.

Officials say the two heart transplant patients who died had contracted fungal infections and stayed in the unit. One was infected in October 2014. The other in June.

UPMC's quality control chief, Tami Minnier, says doctors don't know if the infections played a role in their deaths. A review of patient records found their infections started nearly a year ago.

PITTSBURGH — U.S. Steel is eliminating jobs at its downtown Pittsburgh headquarters.The company Thursday didn't specify the number of cuts. It says they won't affect unionized workers.A spokesman says U.S. Steel is continuing to adjust its work force to operational and business needs.The company issued layoff warnings to production workers earlier this year and has idled steel-making operations in Texas, Illinois and Ohio.The Pittsburgh layoffs come as the company plans to move its headquarters in 2017 to a new building on the former Civic Arena site.

PITTSBURGH — The Pennsylvania Department of Transportation has asked Amtrak about adding a second daily round-trip train between Harrisburg and Pittsburgh.PennDOT project manager Jennie Granger said Amtrak is looking into what it would take to make an additional round-trip each day for the Amtrak Pennsylvanian.The Pennsylvanian is one of 29 short-distance Amtrak lines receiving state funding when passenger revenue doesn't cover the costs. The line almost disappeared in 2012 when federal regulations began requiring state subsidies on short distance trips. PennDOT paid Amtrak $14.5 million in the 2014-15 fiscal year for the Pennsylvanian and service from Harrisburg to Philadelphia.Amtrak spokesman Craig Schulz says it's a popular route and the company is willing to look into providing more service to Pittsburgh.