Oil spill ##s to Mississippi , Alabama . U.S. conducts criminal investigation into oil spill . Mississippi makes a third of Gulf off - limits to fishing . BP puts cost of the response at $ 1 billion .
Oil spill spreads to Mississippi , Alabama . U.S. begins criminal investigation into oil spill . Spill makes a third of Gulf off-limits to fishing . BP puts cost of spill response at $ 1 billion .