July 5, 2012:

Royal Dutch Shell PLC (RDSA, RDSB, RDSA.LN, RDSB.LN) reported flaring Wednesday at its refinery in Deer Park, Texas, according to a government filing made public Thursday. The 327,000 barrel-a-day refinery sent sulfur dioxide to its flare, according to Shell's filing with the National Response Center. The company was investigating the cause of the flaring, an incident that generally stems from equipment failure. A Shell spokesperson was not immediately available. The London-based company operates the refinery as part of a joint venture with Mexican state-owned oil company Petroleos Mexicanos.

By Dow Jones Newswires