Engineers planned to monitor the well overnight and continue pumping in thousands of gallons of the drilling fluid, which is about twice as heavy as water.
"The absence of any news is good news," said Coast Guard Admiral Thad Allen, who is overseeing the operation. He added: "It's a wait and see game here right now, so far nothing unfavorable."
Meanwhile, dozens of witness statements obtained by The Associated Press show a combination of equipment failures and a deference to the chain of command impeded the system that should have stopped the gusher before it became an environmental disaster.
The live video stream Wednesday showed pictures of the blowout preventer and oil gushing out. At other times, the feed showed mud spewing out, but BP said this was not cause for alarm.
A weak spot in the blowout preventer could give way under the pressure, causing a brand new leak.
Frustration with BP and the federal government has only grown since efforts to stop the leak have failed.
Louisiana Gov. Bobby Jindal and Plaquemines Parish President Billy Nungesser, both outspoken critics, led a boat tour around the oil-fouled delta near the mouth of the Mississippi River. Some 100 miles of Louisiana coastline had been hit by the oil, the Coast Guard said.
Through the Mississippi's South Pass, there were miles-long passages that showed no indication of oil, and the air smelled fresh and salty. Nearby, fish were leaping and tiny seabirds dove into the water.
But not far away at Pass a Loutre, the oily water smelled like an auto shop.
"There's no wildlife in Pass a Loutre. It's all dead," Nungesser said.
BP has had some success in siphoning oil from a mile-long tube, which has sucked up 924,000 gallons of oil since it was installed last week. Engineers, though, had to move the device during the top kill.
The Coast Guard also said only a small amount of dispersants were used Wednesday in an effort to reduce the chemicals in the Gulf, but crews were continuing the burn and skim the oil off the surface.
Engineers are working on backup plans in case the procedure doesn't work, including a bid to cap the well with a small containment dome. Suttles, for his part, is trying to temper expectations. He said it's too early to express optimism about the top kill.
"It's too hard to say. We've all been here a long time," said Suttles. "We've ridden a roller coaster and we need to take the next 24 hours and see what the results are."
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