This morning several bombs were set off in London in a coordinated effort to attempt to dispense maximum disruption and terror to those in the city. You can find news about the events on the BBC website. If anyone is worried about relatives or friends that may have been affected or caught up in the events, please do ring them first, then use the emergency contact number 0870 1566344 (source).
Commuting services in and out of London are obviously affected (and won’t be back to ‘normal’ anytime soon) so best check online or with relevent information desks to ensure that any services that you wish to use are in service.