I pray for our planet!
The US president has travelled to Louisiana to visit the area most in peril from the slick which
continues to grow, having already tripled in size, in the Gulf of Mexico.
Speaking at a news conference shortly after his arrival he said: "BP is responsible for this leak. BP will be paying the bill.
"But as President of the United States, I'm going to spare no effort to respond to this crisis for as long as it continues."
Meanwhile, US officials have closed commercial and recreational fishing for a minimum of 10 days in federal waters affected by the spill, the National
Oceanic and Atmospheric Administration has said.
The man charged with running the White House response says the slick is likely to hit the Gulf Coast shoreline "at some point".
Bottom line is this: this oil spill threatens not only our wetlands and our fisheries but our way of life.
Lousiana Governor Bobby Jindal
Coast Guard Commandant Thad Allen said: "There's enough oil out there, it's logical to assume it will impact the shoreline at some point. The
question is where and when."
High winds are hampering attempts to prevent the slick from hitting land and there has been some evidence of oil already washing to the shore.
Engineers have still not been able to shut off the flow from the ruptured well.
Rig operator BP told Sky News it was doing everything possible to tackle the problem and ensure the clean-up operation was successful.
But the company is facing criticism over its planning for such a disaster and the subsequent handling of it.
On one of the Mississippi Delta's bayous, only accessible by boat and home to people who live off the water, communities are expressing their
Stefanie Sandbom told Sky News: "I want answers. I want to know why this happened, why it took eight days before anyone even thought this was going
to hit our coast?
A satellite picture shows the oil slick in the Gulf of Mexico
"I think we have been lied to and I think our whole community understands that."
The waterways are among the most unusual communities in the world.
One man arrived by raft from Cuba and continues to live and work from a shack he shares with beagles and a dozen chickens.
Much of the complex of watery lanes, small islands and canals have vanished in the last few decades due to erosion that followed the building of
levees to protect New Orleans.
The BP rig explosion
The region's fishing and tourism industry is worried about the impact of the slick.
Captain Boola, who runs the Reel Tite fishing company, said: "A lot of these people lost everything Hurricane Katrina.
"It is like you have been stitched up and someone comes along and rips out the stitches."
Wildlife experts remain on stand-by to deal with the impact on the area's wide range of bird and aquatic life.
The spill has also raised questions about the future of oil drilling in the Gulf of Mexico, something President Obama wants to expand.
Louisiana Governor Bobby Jindal said: "Bottom line is this: this oil spill threatens not only our wetlands and our fisheries but our way of life."