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>> do we know how many assets or what sort of intelligence we actually have about these groups in yemen? was the u.s. aware of this gathering? >> well this, is the absolute critical question right now. did the u.s. know about it, or is the intelligence about yemen right now so spotty that they did not know? one of the things that concerns the cia, the white house, the pentagon the most is this al qaeda group has gone underground in its communications to a large extent. they are staying off the internet. they are staying off cell phones. they have gone back to using couriers a good deal because...

Jimmy nelson says when looking for wreckage, manned submersibles offer important dimension. sometimes having a human being can spot things an unmanned submersible cannot spot. >> correct. >> reporter: this could be sent in to action underwater in an effort to solve a mystery. gary tuchman, cnn, fort pierce, florida. >> incredible technology. for more on the story and others go to cnn.com. coming up, could a new system for tracking planes with gps and satellites prevent this type of situation from happening again? and the question is, if so, why isn't it being implemented right now? also, l...

Secret service car. the results confirmed that sinclair's statement, that the secret service cars were over the center line. >> i think that the amount of the vehicle over the center line, as i recall, was something in the neighborhood of one-third or one-half of the vehicle. it wasn't fully in the oncoming lane. >> the highway patrol had determined that the collision was virtually head-on. blythe showed that the sheriff's car had struck at an angle, as if agent labarge had been turning back to the right to get back into his own lane. dr. blythe determined that the critical skid mark was made ...

>> ten-degree approach angle between these two vehicles places the secret service dodge aries within its lane of travel, and moving slightly from left to right as a potential evasive tactic as impact takes place. >> eyewitness testimony established that the secret service agents were driving at around 35 miles per hour. the critical question was how fast was deputy sinclair driving? sinclair claimed he was going 55 or 60 miles per hour. applying the laws of conservation of momentum, mait calculated he was actually doing 76 miles per hour. >> when he came into that curve, his vehicle was out of...

Places the secret service dodge aries within its lane of travel, and moving slightly from left to right as a potential evasive tactic as impact takes place. >> eyewitness testimony established that the secret service agents were driving at around 35 miles per hour. the critical question was how fast was deputy sinclair driving? sinclair claimed he was going 55 or 60 miles per hour. applying the laws of conservation of momentum, mait calculated he was actually doing 76 miles per hour. >> when he came into that curve, his vehicle was out of position for the speed that he was traveling. when he s...