Head over to Instapundit for a roundup on the terror attacks in London and The Command Post for updates throughout the day.

Obviously, attacks on big-city commuters make me particularly jumpy. A reminder, as if one were needed, that the war goes on, the task is not done, and the security in big urban areas will never be enough. Keep pulling them out at the roots; it's the only way.

UPDATE: Well, this is cheery:

The London bombings are likely part of a wider al Qaeda summer offensive. A letter attributed to Osama bin Laden addressed to the Muslim community (ummah) surfaced in Pakistan on June 20, stating that he was "preparing for the next round of jihad." He wrote that "we want to give good news to the Muslim ummah that, with the blessings of Almighty Allah, we have been successful in reorganizing ourselves and are going to launch a jihadi program that is absolutely in accordance with the changed situation." He stated that new recruits were ready, and that they were armed with the weapons of the enemy (no indication what that means exactly). He also threatened the rulers of Muslim countries who have not signed onto his program (which is all of them, at least publicly). More foreign fighters have appeared and are active in Afghanistan and diplomats from Muslim countries are being systematically targeted in Iraq.

Empty bravado, perhaps. It often has been. But not always.

SECOND UPDATE: More to come?

A British reaction.

Mark Steyn, writing before the attacks in this week's London Spectator:

It feels like summer. Summer 2001, that is. Then, as now, Africa was in the news. There was a big UN conference on 'racism' in Durban the week before 11 September. Remember that? They demanded America pay reparations - for the Rwandan genocide. And Robert Mugabe was cheered to the rafters when he called on the United States and the United Kingdom to 'apologise unreservedly for their crimes against humanity'.

Four years later, plus ca change. . . in different ways, at Ground Zero and in Hyde Park, we've taken four years to come back to where we were on 10 September 2001.

Read the whole thing.

Rudy Giuliani was near the site of the first bombing this morning. It's like Bruce Willis in Die Hard II: what are the odds on that?