This just in from Hot Tipper Janna:

A friend is at SeaTac airport which, he reports on his blog, is in security shutdown, though he has no word on why. Here's the entry and, knowing him, he'll continue to report as he gets news.

The news so far, from blogger Jay:

Sea-Tac is in a security lock down. No flight operations, everything is frozen. No further info. Group of writers trapped at C2D.

Stay tuned.