Someone or the NSA? If I was them I would hijack some poor country ISP and siphon everything through them. At this point assuming it's the NSA should be the default assumption. Remember that Snowden's encrypted data (assuming it's real) includes everything not yet public. So likely we only know a fraction. Thus assuming NSA is probably safe.
Maybe it was Santa Claus and he used Iceland because it reminds him of the Arctic. During this time of year, assuming it's Santa Claus should be the default assumption. Remember that He is "making a list" and "checking it twice". So assuming it's Santa Claus is the best bet.
