at 2:15, bp tweets, "the well integrity test was starting."ur and ten minutes later, bp confirms what we could all see in the image. >> there is no flow of oil going into the gulf of mexico. >> reporter: it did not take long for word to travel. in louisiana, billy nungesser got word during a town meeting. >> the well has been stopped, so -- it has been stopped. >> reporter: our cameras were rolling at the lsu oil well research lab. bp confirms, no more oil going into the gulf. 3:25 eastern. >> that's great news. >> reporter: even the president was encouraged, though cautious with his words. >> i think it is a positive sign. we're still in the testing phase. i have more to say about it tomorrow. >> reporter: residents along the coast tonight are not holding back. >> i'm so relieved. thank god. i'm praying for those people. >> i'm very happy about the way that they were able to get the well closed. we've got a long way to go, though. >> we hope for the best. we prepare for the worst. we know there's backup plans in place. in terms of what this m

at 2:15, bp tweets "the well integrity test was starting." an hour and ten minutes later, bp confirms what we could all see. the oil, completely shut off. >> there is no flow of oil going into the gulf of mexico. so, obviously, this is an encouraging point of time. remember, this is the start of our test. >> reporter: we were at the lsu oil well research lab when the news crossed. bp confirms, no more oil going into the gulf of mexico. 3:25 eastern. >> that's great news. >> reporter: from the gulf -- >> i hope it's permanently. we need that closure so we can finish cleaning up the oil and get our lives back. >> reporter: to the white house. >> i think it is a positive sign. we're still in the testing phase. i'll have more to say about it tomorrow. >> reporter: and what comes next are those crucial readings, measuring the pressure of the oil pushing up against that cap. engineers hoping for 8,000 to 9,000 psi, pounds per square inch. anything 6,000 psi or lower is trouble. does that mean oil is leaking elsewhere from the well? >> that means oi

at 2:15 bp tweets, the well integrity test was starting.art of our test. >> reporter: we were at the lsu oil well research lab when the news crossed. bp confirms no more oil going into the gulf, 3:25 eastern. >> that's great news. >> reporter: from the gulf -- >> i hope it's permanently. we need that closure so we can finish cleaning up the oil. >> reporter: to the white house. >> i think it is a positive sign. we're still in the testing phase. i'll have more to say about it tomorrow. >> reporter: what comes next are those crucial readings, measuring the pressure of the oil pushing up against that cap, engineers hoping for 8,000 to 9,000 psi, pounds per square inch. anything 6,000 psi or lower is trouble. in fact, the coast guard signaling that siphoning the oil is still a real possibility, even if the cap continues to work. it looks like this one, three of these stacked on one another down on the sea. they remind us the ultimate solution remains the relief well. one of them very close at this point. the dirt, the mud, the concrete, already

yesterday, bp shut down three valves, one after the other. then, at 2:15 p.m., the company tweeted the well integrity test was starting. 70 minutes later, bp confirmed what the picture showed. >> there is no flow of oil going into the gulf of mexico. >> reporter: now, comes the next step. measures the measure of the oil on the new containment cap, if it olds. >> we need to be cautious right now. >> reporter: scientists hope the next two days of reading are between 8,000 pounds or 9,000 pounds per square inch. 6,000 pounds or lower means the well is leaking. president obama stopped short of declaring full success. >> i think it ice a positive sign. >> reporter: like so many gulf coast residents, he's waiting to see if there is nothing after today. >> we need closure to clean up the oil. >> reporter: even if the cap holds, bp is likely to release the oil again. and here is why. the coast guard says an improved siphoning system should be able to capture all of the escaping crude. rob and meg, back to you. >> what do we expect the next ow hours of tests will tell us about the well? >>

. >> larry: when we come back, we'll get a tweet on this question of bp. i want to run a marathon. i'm going to work with kids. i'm going to own my own restaurant. when i grow up, i'm going to start a band. [ female announcer ] at aarp we believe you're never done growing. thanks, mom. i just want to get my car back. [ female announcer ] together we can discover the best of what's next at aarp.org. >> larry: we got calls for you, michael. first, what are your thoughts about tony hayward, the ceo, stepping away with $900,000 a year in pensions and stock options worth millions? >> so what's new? i mean, that's -- that's what they do. that's why every time you fill up at bp you'll help contribute to his pension fund. and now here comes the fan mail from the independent gas station owners who really have nothing to do with bp. okay. >> larry: let's get a call. orlando, florida. hello. >> caller: hello. michael, when obama was running for president, he received a record number of small donations from average-income americans like myself. the supreme court has now ruled that corporations