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[cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2010/images/06/04/kyra.bp.rig.cnn.art.jpg caption="CNN's Kyra Phillips takes a tour of the BP oil rig spill site with Coast Guard Admiral Thad Allen."]
With containment cap in place, BP waits to see if it works
(CNN) – BP may learn Friday how effective the new cap it placed on the ruptured undersea well is in slowing down the largest oil spill in U.S. history.
The complex underwater maneuver completed Thursday night was applauded by U.S. and BP officials.
"The placement of the containment cap is another positive development in BP's most recent attempt to contain the leak, however, it will be sometime before we can confirm that this method will work," said Coast Guard Lt. Commander Tony Russell. "Even if successful, this is only a temporary and partial fix and we must continue our aggressive response."
Robot submarines steered the new cap to BP's ruptured undersea well in the Gulf of Mexico at about 10 p.m. Thursday. But early Friday morning a non-stop cloud of oil was still spewing from the pipe . Read more
Program note: A CNN exclusive this morning: Our Kyra Phillips is the only reporter to go on board the rigs near where BP is desperately trying to cap the well and cut off the oil spill. She traveled there with National Incident Commander Adm. Thad Allen and she'll join us live with her report.
Full coverage | LIVE: Undersea view 
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