Blast at London subway station called an act of terrorism

Forensics officers in protective gear were at the scene of Friday’s terrorist attack at Parsons Green subway station in London.

In a photo provided by police, flames rise from an improvised device left in a shopping bag on a London train before it exploded Friday, injuring 22 people.

A woman is escorted away from Parsons Green Underground station in London.

A rescue worker carries equipment toward the Parsons Green subway station after the explosion.

Friday’s attack targeted Parsons Green station in west London.

A woman reacts as she talks on a phone near Parsons Green tube station in west London.

Police escort people to safety as they work near Parsons Green station in west London.