Islamic State group says affiliate responsible for London attack

The Islamic State group is taking responsibility for the London subway explosion earlier today. 

 Authorities say 29 people were injured in the attack, most suffering flash burns.

The bomb went off around 8:20 a.m. as the train, carrying commuters from the suburbs -- including many school children -- was at Parsons Green station in the southwest of the city. 

The Islamic state says the attack was carried out by an affiliated unit.