US STOCKS-S&P, Dow poised for worst losing streak since August
* Fed cuts economic growth to 2 percent for 2016, 2017
* BoE, BoJ keep monetary policy largely unchanged
* Steady interest rates due partly to Britain's EU vote - Yellen
* Indexes down: Dow 0.68 pct, S&P 0.83 pct, Nasdaq 1.04 pct (Adds details, comments, updates prices)
By Yashaswini Swamynathan
June 16 (Reuters) - The S&P and the Dow were down for the sixth day, a streak unseen since August, as the Federal Reserve's comments about an economic slowdown and the prospect of Britain's possible exit from the European Union spooked investors.
The Fed kept short-term interest rates unchanged on Wednesday but said it continued to expect two rate hikes this year. However, the consensus seemed shakier with six of the 17 policymakers projecting just one hike. In March, only one official had done so.
Fed Chair Janet Yellen sounded caution that the central bank needed to see more clear signs of economic strength before lifting rates and threw some blame of her current stance on the June 23 Britain vote on its membership in the EU.
The central bank also lowered its economic growth forecast for this year and the next to 2 percent from 2.1 percent. Continuación...