Source: Jill Lawless, The Associated Press, September 15, 2017 

LONDON — Hundreds of British police embarked on a massive manhunt Friday, racing to find out who placed a homemade bomb on a packed London subway train during the morning rush hour.

The explosion — labeled a terrorist attack by police — wounded 22 people and ignited a panicked stampede to safety. Experts said London may have escaped far worse carnage because it appeared that the bomb only partially exploded.

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Image source: An injured woman is assisted by a police officer close to Parsons Green station in west London after an explosion on a packed London Underground train, Friday, Sept. 15, 2017. (Dominic Lipinski/PA via AP)