LONDON, Sept. 15 (Xinhua) -- London police said Friday that the home-made explosive device partially detonated in the morning rush-hour blast in a subway station in London.
Twenty-nine people, including a young boy, were injured when the bomb sent a ball of fire on a packed carriage of a District Line train at Parsons Green subway station.
The device had a timer, police said.
Nobody suffered life-threatening injuries in the incident, the fifth terrorist attack Britain has suffered in less than six months. They are being treated in hospitals mainly for burn injuries.
The Islamic State's Amaq News Agency said Friday night that the terrorist group claimed responsibility for the subway explosion in London.
London police said that the Friday blast is a terrorist attack.
A massive hunt for the perpetrator is under way, and London police called upon people to provide information that would help identify and arrest the man who placed the explosive device on the train.
The subway blast came after four deadly terrorist attacks in London this year -- Westminster Bridge, London Bridge and Finsbury Park, and one in Manchester at an Ariana Grande concert.
