
The blaze erupted at 8:43 a.m. on Line 5 between Yeouinaru and Mapo stations when a man in his 60s used a torch-style lighter to set clothing ablaze after boarding with a container of oil, witnesses said.
Twenty-one passengers were hospitalized for smoke inhalation and ankle injuries sustained during the chaotic evacuation. No fatalities were reported.
Train operators and passengers wielded fire extinguishers to contain the flames before firefighters fully extinguished the blaze at 10:24 a.m. Emergency responders deployed 230 personnel, including 166 firefighters and 60 police officers, along with 68 pieces of firefighting equipment.
Police arrested the suspected arsonist near Yeouinaru station at 9:45 a.m. Service between Yeouido and Aeogae stations was suspended until 10:06 a.m., with trains bypassing Mapo and Yeouinaru stations during the emergency response.
Investigators are examining the scene and questioning the suspect to determine the motive behind the arson attack.
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