Charged with deleting messages about company’s response to 2010 Gulf of Mexico oil spill
At least 26 cars went off tracks in city west of Baton Rouge, La., police said
At least 30 others taken to area hospitals following blast
Fire broke out at Williams Companies Inc. plant in Geismar, La., 30 kilometres south of Baton Rouge
Collision caused oil to leak from barge; extent of damage not yet known
