insights and getting up early for us. thank you. >> thank you. now another sell-off on wall street. stocks in tokyo and seoul have been down most of the day. chinese markets in hong kong and shanghai have been in and out of positive territory. the dow dropped more than 550 points tuesday, wiping out all of its gains for the year. plunging oil prices pulled down energy stocks and analysts say investors are worried about rising interest rates and the ongoing trade war between the u.s. and china. cnn's alison kosik has more on what's behind the stock slide. >> reporter: all the major indices have wiped out their gains for the year. it's a headline that's undercut investor confidence and set the negative tone in the market. tech stocks dragged the market lower. ironic since it was tech shares like facebook, apple and google that powered the market to record highs over the last few years. but now it look likes the