I don't know what's going on either, but the SLV chart is looking really toppy, with massive volume last week. When volume spikes after a big move, it's a definite blowoff warning. And of course, there's that nagging issue of the weak silver stocks.
Things could change overnight, but it's very possible this is the start of a major correction in silver, and possibly the other PMs.
This is one of those times when there are no obvious fundamental reasons for a price move. Which is why I trade technically. Once a price move has happened, the fundamentals may reveal themselves - but it's too late.