Chemical Safety Board launches Oklahoma rig explosion investigation

In this photo provided from a frame grab from Tulsa's KOTV/NewsOn6.com, fires burn at an eastern Oklahoma drilling rig near Quinton, Okla., Monday Jan. 22, 2018. Five people are missing after a fiery explosion ripped through a drilling rig, sending plumes of black smoke into the air and leaving a derrick crumpled on the ground, emergency officials said. (Christina Goodvoice, KOTV/NewsOn6.com via AP
In this photo provided from a frame grab from Tulsa's KOTV/NewsOn6.com, fires burn at an eastern Oklahoma drilling rig near Quinton, Okla., Monday Jan. 22, 2018. Five people are missing after a fiery explosion ripped through a drilling rig, sending plumes of black smoke into the air and leaving a derrick crumpled on the ground, emergency officials said. (Christina Goodvoice, KOTV/NewsOn6.com via AP

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