As of 5.30pm on Friday, NHS England said it was now treating 21 patients. Eight others were discharged earlier in the day.
All you need to know about what is known - and what is not - about the bomb attack on a London Tube train.
The installation of CCTV cameras on the the Tube could play a key role in finding the perpetrator of the Parsons Green explosion.
Theresa May rebuked the US president after he implied the London tube blast was carried out by suspects "in the sights" of Scotland Yard.