"The federal agency responsible for regulating U.S. offshore oil drilling repeatedly ignored warnings from government scientists about environmental risks in its push to approve energy exploration activities quickly, according to numerous documents and interviews."

"As the price tag for what could be the modern world's largest man-made oil spill continues to mount, navigating the complex path towards determining who will foot the bills resulting from the Deepwater Horizon accident could become as difficult as avoiding the oil plume in the Gulf of Mexico."

"Although the exact cause of the Deepwater Horizon explosion isn't certain, at least a dozen offshore drilling experts agree that cement, or pipes encased by cement, had to have failed first."

"The gooey oil washing into the maze of marshes along the Gulf Coast could prove impossible to remove, leaving a toxic stew lethal to fish and wildlife, government officials and independent scientists said."

"In the days since President Obama announced a moratorium on permits for drilling new offshore oil wells and a halt to a controversial type of environmental waiver that was given to the Deepwater Horizon rig, at least seven new permits for various types of drilling and five environmental waivers have been granted, according to records."

"BP has rebuffed demands from government officials and environmentalists to use a less-toxic dispersant to break up the oil from its massive offshore spill, saying that the chemical product it is now using continues to be 'the best option for subsea application.'"

"The coal baron who runs the West Virginia mine that last month saw the deadliest U.S. mine accident in 40 years came unbowed to Capitol Hill today, insisting that his company 'does not place profits over safety.'"

"The Environmental Protection Agency has directed oil giant BP to use a less toxic form of chemical dispersants to break up the oil spill in the Gulf of Mexico."

A CBS News crew captured on video orders from BP contractors and US Coast Guard officials to stop filming environmental damage from the BP-owned oil fouling Louisiana beaches and coastal wetlands. The Coast Guard denied that it or BP has rules prohibiting coverage.

"Today the U.S. Environmental Protection Agency (EPA) and the Department of Homeland Security (DHS) took steps to increase the transparency of the response to BP's catastrophic oil spill in the Gulf of Mexico. The oil company's actions have been criticized for failing to disclose or monitor important information about the spill, including the quantity of oil erupting into the Gulf, the potential health impacts of the oil and the chemicals used to disperse it, and water and air quality information."