An arson warning note found on the 1st in a train on Busan Metro Line 2. Provided by Busan Transportation Corporation A note warning of arson was discovered on a Busan Metropolitan Railway train, and the police began an investigation. On the 1st, the Busan Transportation Corporation and the police announced that a note saying ‘I will set fire to the train’ was found on Train 2181, which arrived at Jangsan Station (Line 2) on the Busan Metropolitan Railway at around 3:55 p.m. The note said, ‘Line 3 Yeonsanbang until July 3.’