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Investigations Topic

CSB issues update on fatal AES explosion investigation

March 16, 2026 · The CSB is investigating Accurate Energetic Systems’ “melt-pour” manufacturing process, process safety management, and industry guidance for commercial high explosive manufacturing.

OSHA fines U.S. Steel, MPW Industrial Services for Clairton Coke Works explosion

February 24, 2026 · OSHA investigators concluded U.S. Steel and MPW Industrial Services exposed workers to explosion, struck-by, and high-pressure injection hazards, proposing nearly $180,000 in fines.

CSB releases final report on hydrogen sulfide release at PEMEX Deer Park Refinery

February 23, 2026 · The CSB concluded PEMEX Deer Park Refinery operators and contractors failed to correctly identify process equipment, assess hazards, and deviated from established policies and procedures.

FMCSA warns 550 CDL training schools of shut down for safety noncompliance

February 20, 2026 · The Federal Motor Carrier Safety Administration found over 550 CDL schools in violation of its safety standards, warning they may be removed from the national training provider registry.

NHTSA recalls over 5,000 new USPS trucks for missing brake pin

February 20, 2026 · After a USPS Next Generation Delivery Vehicle lost brake function, NHTSA and Oshkosh recalled all NGDVs produced because the brake pedal mounting pin and retaining clip might not be connected.

OSHA cites Horizon Biofuels nearly $150K for willful safety violations

February 17, 2026 · As part of its investigation, OSHA fined Horizon Biofuels nearly $150K for willful safety violations. A combustible dust explosion killed three at its Fremont, Nebraska facility last year.

CSB launches investigation into Woodland Pulp chemical release

February 10, 2026 · According to initial information submitted to the CSB, the fatal incident in Baileyville, Maine may have involved the release of hydrogen sulfide in an enclosed process sewer.

OSHA finds CB&A Construction exposed workers to trench collapse hazards

February 9, 2026 · OSHA investigators found CB&A Construction employees worked under suspended loads without hard hats and along trench edges without protective restraints in Bessemer, Alabama.

CSB releases video on combustible dust explosion at Didion Milling

February 6, 2026 · In addition to describing 13 key safety issues, the CSB’s video on the Didion Milling explosion calls on OSHA to develop an overarching combustible dust standard for general industry.

NHTSA recalls 40 new USPS trucks after rear wheels fall off

February 6, 2026 · After two reports of rear wheels falling off Oshkosh’s Next Generation Delivery Vehicles, the NHTSA recalled 40 U.S. Postal Service vehicles and the company issued repair instructions.

OSHA settles with DME Construction over fatal fall through skylight

January 30, 2026 · Long Island, New York-based roofing contractor DME Construction must pay a $600,000 penalty and implement enhanced OSHA abatement measures following a skylight fall fatality in 2021.

MSHA: Signal Peak Silica did not inspect and maintain dam in 2025 collapse

January 30, 2026 · In its final report, MSHA found Signal Peak Silica and Stout Excavating did not inspect and maintain the tailing pond dam that ruptured, overturning an excavator & killing the operator.

CSB commends St. Louis Board of Aldermen for implementing recommendations

January 23, 2026 · The CSB commended the St. Louis, Missouri, Board of Aldermen for following its recommendation to revise the city’s Mechanical Code to meet national pressure vessels and boiler standards.

OSHA orders Balkan Express to reinstate worker who reported safety concerns, pay $100K

January 9, 2026 · OSHA ordered Balkan Express LLC to reinstate a worker after they reported safety concerns and pay $100,000. FMCSA inspectors placed 23% of the company’s fleet OOS in the past two years.

CSB recommends facility siting evaluation to U.S. Steel

December 30, 2025 · After a fatal explosion, the CSB called on U.S. Steel to conduct a facility siting evaluation at its Clairton Coke Works to address immediate hazards to workers based on building locations.