Hydrofluoric acid (HF) leaked from an alkylation unit at BP Plc's 406,570-barrels-per-day refinery in Texas City, Texas on Tuesday morning, triggering alarms in the plant and warnings to area resid

BP Plc's U.S.

A federal judge on Tuesday said two environmental groups' could sue for enforcement of federal pollution standards at Exxon Mobil Corp's Baytown, Texas, refinery, the nation's largest.

Exxon, the largest U.S. refiner, had asked federal Judge David Hitner to throw out the lawsuit because the Baytown refinery is already subject to federal Clean Air Act enforcement by the U.S.

TransCanada Corp's 591,000 barrel-per-day (bpd) capacity Keystone pipeline resumed shipping crude oil, one week after being shut by a leak at a Kansas pumping station, the Calgary-based company said in a statement.

The restart comes a day after the U.S.