People hold a banner that reads "You have blood on your hands" and stop traffic during a silent protest to commemorate the 15 victims of a railway roof collapse six weeks ago, demand accountability for the tragedy, in Belgrade, Serbia, Friday, Dec. 13, 2024. (AP Photo/Darko Vojinovic)

People stopping traffic stand in silence to commemorate the 15 victims of a railway roof collapse six weeks ago, demand accountability for the tragedy, in Belgrade, Serbia, Friday, Dec. 13, 2024. (AP Photo/Darko Vojinovic)

People stopping traffic stand in silence to commemorate the 15 victims of a railway roof collapse six weeks ago, demand accountability for the tragedy, in Belgrade, Serbia, Friday, Dec. 13, 2024. (AP Photo/Darko Vojinovic)

People hold a banner that reads "You have blood on your hands" and stop traffic during a silent protest to commemorate the 15 victims of a railway roof collapse six weeks ago, demand accountability for the tragedy, in Belgrade, Serbia, Friday, Dec. 13, 2024. (AP Photo/Darko Vojinovic)

People stopping traffic hold placards and stand in silence to commemorate the 15 victims of a railway roof collapse six weeks ago, demand accountability for the tragedy, in Belgrade, Serbia, Friday, Dec. 13, 2024. (AP Photo/Darko Vojinovic)