美国有线新闻 CNN 2015-11-03（在线收听）

 Officials are trying to figure out what caused a tragic plane crash in Egypt's Sinai Peninsula. Kogalymavia Flight 9268 crashed on Saturday morning, killing 224 people aboard. It was traveling from Egyptian resort city of Sharm el-Sheikh to the Russian city of St. Petersburg. Many of those aboard were Russians coming home from vacation. Russian president Vladimir Putin declared yesterday a national day of mourning. The plane went down in clear weather of little more than 20 minutes after take off. A Russian official reportedly said it broke up in midair. The area where crash is home to Islamic militant fighters who are associated with ISIS terrorists.  But though they made a statement that appeared to claim the responsibility, Russian and Egyptian officials say that's unlikely. Egyptian president Abdel Fattah al-Sisi says the investigation could take months. Moving to the Middle Eastern nation of Syria now where the US is escalating its fight against the ISIS terrorist group. President Obama announced Friday that a small number of American troops would be deployed to northern Syria to help different groups there battle ISIS. He authorized fewer than 50 special operation forces to go but a US official says more could be sent later on. The White House believe that the additional US troops will be effective in helping weaken ISIS but it's a significant change in plan for the Obama administration which said last year that no US troops will be involved in direct combat with ISIS.  Democrats and republicans are calling for the president to lay out a clear strategy for dealing with the terrorists. Some concerned  about mission creep when an initial military goal gradually expands. As part of its ongoing air campaign in Syria, the US military has used drone unmanned aircraft for both surveillance and attack missions. At the consumer level they've given users bird's eye views of - well, anything. Once again, they're expected to be a popular Christmas gift this year, something that retailers and the Federal Aviation Administration are watching. They breached some of the most secure air space in the US, including the White House and they've nearly collided with the commercial plane even medical chopper en-route to emergencies. In most cases, authorities get the drone but not the operator.  Federal safety regulators hope that's about to change. We're going to require operators of drone to register their aircraft. The FAA hopes to force consumer to provide personal information when they buy a drone so that it can be tracked back to the owner. I think many if not most users will comply because there're penalties that associate with using these devices and national air space without complying the registration requirements.  The FAA says this year pilots report around 100 drone sightings every month with nearly 1000 drone sightings so far this year the number of report has nearly quadrupled since 2014. But key questions remain, about what personal information of consumers will have to provide and how regulators will enforce it. ReneMarsh CNN. Washington.