Four planes were hijacked this morning, two of them crashed into the World Trade Center, one hit the Pentagon in Washington DC, and the last one crashed in a rural area in Pennsylvania. The World Trade Center has been flattened and a section of the Pentagon is also damaged.

There are several sites with constant updated coverage: CNN, Washington Post, Yahoo! News, NY Times, and more from Google.

Several concerts have been cancelled due to the mornings events, I for one was supposed to be at a Modest Mouse show. NME is reporting that the Madonna show tonight in Los Angeles has been cancelled. I imagine that there are several shows across the country that have been cancelled as well. Also, MTV and VH1 have suspended broadcasts and are showing a live CBS news feed.

If you would like to help, the best thing to do is give blood as there is already a nation-wide shortage. Go to the Red Cross website to find a location closest to you.