BERMAN: U.S. investigators are standing by ready to help figure out what caused MetroJet Flight 9268 to crash in Egypt's Sinai desert. U.S. sources tell CNN that Egypt has accepted an offer upheld from the National Transportation Safety Board. The NTSB team will assist in what brought down the Russian jetliner from Sharm el-Sheikh. Let's bring in CNN's Ian Lee. Ian, what's the latest here? Where are we now in this investigation?</s>IAN LEE, CNN REPORTER: Well, good morning, John. And the NTSB will be coming to Egypt to look at the engines, in particular. These engines were manufactured in the United States. They'll be looking to see if they were possibly reamed to the cause of this crash. The Egyptians are not ruling out anything at this point. But this will be crucial. The Egyptian have said this is one of their theories, the NTSB will be able determine if it did or if it didn't happen. But we are also learning as well the hours between that crash happening and that information released, we are told all that information was locked down, so that there could be an investigation. And also so no one can tamper with the CCTV footage of the scanners, the monitors at the airport. And also, everyone was also interrogated, interviewed by state security here in Egypt -- everyone from the person that checked them in to handle their bags, also the caterers. So, Egypt is not ruling out any possibility at this hour, although predominant theory is right now that it was a bomb that took down that plane.</s>BERMAN: All right. Ian Lee at Sharm el-Sheikh with the latest on the investigation, thanks so much.</s>ROMANS: All right. Republicans running for president, they face off on the economy. There were some heated moments. We're going to tell you who came out on top.</s>BERMAN: I like the fact that they're moving in a different direction. Look at the move.
U.S. to Help Investigate Russian Jet Crash.