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WASHINGTON — A new EPA rule that sets tougher standards for deadly soot pollution faced a barrage of legal challenges March 6, as 25 Republican-led states filed lawsuits seeking to block it.

Following a Senate committee’s approval of Acting Labor Secretary Julie Su’s nomination to lead the department, congressional Republicans renewed their opposition efforts.

Senate Majority Leader Chuck Schumer called on the Federal Trade Commission to open a full investigation into a wave of acquisitions in the oil and gas industry, arguing that the consolidation threatens competition and could lead to higher prices.

DUBAI, United Arab Emirates — A missile attack by Yemen's Houthi rebels on a commercial ship in the Gulf of Aden killed three of its crew members and forced survivors to abandon the vessel March 6.

WASHINGTON — The U.S. Securities and Exchange Commission on March 6 approved a rule that will require some public companies to report their greenhouse gas emissions and climate risks.

NEW ORLEANS — ATA highlighted fleets’ increasing investments in safety programs while industry regulators outlined a plan to continue promoting adoption of driver-assist technologies.

NEW ORLEANS — A panel of executives continued to blast provisions of a $20 billion federal contract to move military families as unworkable and lacking profit-making opportunities.

Environment and Public Works Chairman Tom Carper renewed calls for colleagues to give bipartisan backing to this year’s Water Resources Development Act.

A new partnership has been formed between the U.S. Environmental Protection Agency and U.S. Department of Energy to release $9.4 million in grants to develop future advanced biofuels.

Ohio is putting wrong-way driver technology to use in a new “end-of-queue” warning sign system to deter deadly rear-end crashes at 13 dangerous highway areas.