There are reports of 'incidents' at various tube stations, and on a bus. It's early to tell, but it doesn't look very serious from what we can see at the moment.

It appears that there have been very minor explosions, designed to scare rather than to cause injury. Is someone pulling some kind of perverted practical joke or something? If so, they are going to find themselves in a world of trouble when, and I do mean when, they are caught.

All the mobiles are getting turned off now...

Update 14:15: At least one person injured, phones are back.