NOVI SAD, Serbia (AP) — Thousands joined a protest march on Sunday in the northern Serbian city of Novi Sad that marked one month since a concrete canopy ouside of the city's railway station collapsed, killing 15 people and injuring two.

Protesters held a huge banner with a red handprint at the front of the column — a message for the populist authorities that they have blood on their hands. Participants later left the same symbolic message on the pavement at the main square in Novi Sad while also painting much of the square red.

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