Pool via The Associated PressEmergency workers help people to disembark a train near the Parsons Green Underground Station after an explosion in London on Friday. A reported explosion at a train station sent commuters stampeding in panic, injuring several people at the height of London's morning rush hour, and police said they were investigating it as a terrorist attack.
LONDON — A homemade bomb planted in a rush-hour subway car exploded in London on Friday, injuring 29 people and prompting authorities to raise Britain's terrorism threat level to "critical," meaning another attack may be imminent.
The early morning blast sparked a huge manhunt for the perpetrators of what police said was the fourth terrorist attack in the British capital this year.
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