CNBC : Sentiment turned quite bearish after a reports suggested that billionaire investors George Soros, as well as Carlos Slim and some other influential investors had started paring down positions in silver as well as gold.
Adding to the downward momentum, the CME again raised margin requirements

Interestingly, this event put another pitfall of ETF under the spotlight. One of the key problems with ETFs is that many investors believe they have bought index trackers when clearly many of them are not able to.
The following interview explains it using SLV, one of the largest physically backed silver ETF. Every ETF investor should watch this.