I received a phone call at midnight on Saturday morning from Downing Street. I received a briefing from the Prime Minister. It was clear what the action was going to be. I made clear to her my concern that I feared there would be civilian casualties, given the complicated mosaic on the ground in Syria. That doesn't seem to have happened. But my concern, and it was made to her at the time—. I was very concerned that it wouldn't be possible to take any action without civilian casualties and that was something that I wanted to avoid.