How a train station tragedy threatens to bring down a hardline European president

On the first day of November, Aleksandar Matkovic was running late for a train. He was traveling from Novi Sad, in the north of Serbia, to its capital Belgrade, where he works as an economic historian. When he got to the station, he witnessed a scene of horror that has rocked the country to this day.

​ On the first day of November, Aleksandar Matkovic was running late for a train. He was traveling from Novi Sad, in the north of Serbia, to its capital Belgrade, where he works as an economic historian. When he got to the station, he witnessed a scene of horror that has rocked the country to this day. Read More Breaking News, Latest News and Videos | CNN