Students march during a protest protest that erupted after a concrete canopy fell last month and killed 15 people in Belgrade, Serbia, Wednesday, Dec. 25, 2024. (AP Photo/Darko Vojinovic)

Students shout slogans during a protest protest that erupted after a concrete canopy fell last month and killed 15 people in front of the prosecutor's office in Belgrade, Serbia, Wednesday, Dec. 25, 2024. (AP Photo/Darko Vojinovic)

People stopping traffic, stand in silence during ongoing protests that erupted after a concrete canopy fell last month and killed 15 people in front of the government building in Belgrade, Serbia, Wednesday, Dec. 25, 2024. (AP Photo/Darko Vojinovic)

People stopping traffic, stand in silence during ongoing protests that erupted after a concrete canopy fell last month and killed 15 people in front of the government building in Belgrade, Serbia, Wednesday, Dec. 25, 2024. (AP Photo/Darko Vojinovic)

Students carry banner reading: "Belgrade is the World again" during a protest protest that erupted after a concrete canopy fell last month and killed 15 people in Belgrade, Serbia, Wednesday, Dec. 25, 2024. (AP Photo/Darko Vojinovic)