"ANCHORAGE -- As response teams continued Tuesday to evaluate Royal Dutch Shell's once-grounded oil drilling rig, the Coast Guard, the Obama administration and U.S. Sen. Mark Begich all announced investigations or reviews taking a close look at Shell":

"Tug boats tow 28-tonne Kulluk to nearby Kiliuda Bay where the damage can be assessed after grounding on Alaskan coast."

"ANCHORAGE, Alaska -- Efforts to pull the Shell drilling rig Kulluk from its near-shore perch on rocks and gravel moved ahead mainly in secret Saturday, though officials disclosed Alaska has approved a tow plan to a temporary destination in nearby safe waters and that towing could be attempted at any time."

"Companies will not be able to keep trade secrets for hydraulic fracturing ingredients if a proposed Alaska rule is adopted."

"A Shell Oil drilling rig that ran aground in the Gulf of Alaska has incurred water damage to its deck and electrical systems but is otherwise stable, officials with the response team handling the accident said Thursday."

"The U.S. Coast Guard and Royal Dutch Shell were fighting 70 mile-per-hour winds and 40-foot swells as they tried to assess damage to a floating oil drilling ship that ran aground on a remote Alaskan island."

"ANCHORAGE -- Royal Dutch Shell PLC's foray into Arctic offshore drilling has suffered a serious setback after one of its two Alaska drilling rigs ran aground in shallow water off a small island."

"FAIRBANKS -- Longtime Fairbanks-area resident Suzanne Fenner doesn't have to check the borough's air quality monitoring website to see whether or not pollution is high. She just looks out the front door. When she sees smoke rolling through, she knows she'll be coughing soon enough."

"Fenner, who's lived in Fairbanks since 1986, was shocked to learn recently she'd developed asthma. After being sick off and on for months, her doctor told her the asthma was a direct result of air pollution. ...

"The young, the elderly and the weakened in Fairbanks risk accelerated health problems every winter because of particulate. Much of it comes from wood smoke produced by homeowners trying to cut their fuel bills."

"A photojournalist charters a flight to see just how close Shell's offshore rig is to the protected Arctic National Wildlife Refuge. Turns out a photo is worth a lot more than a bunch of GPS coordinates."