Montserrat "explosion"

Just noticed that the Montserrat Volcanic Observatory have added some new photos to their Flickr page, so had a look at their website to find that the alert level has been upped to 4 (5 being the highest) and that there was an explosion which caused a large pyroclastic flow on Friday.

Some excellent images and a range of videos (including some thermal ones) of pyroclastic flows on the MVO website...