BELGRADE, Serbia (AP) — Thousands of people on Sunday vowed to keep on fighting for justice and rule of law in Serbia as they demanded that President Aleksandar Vucic call a snap parliamentary election following months of persistent demonstrations that have challenged his firm grip on power in the Balkan country.

Protesters led by university students blocked bridges in the capital Belgrade and rallied in 30 other Serbian cities and towns as they also marked exactly seven months since , killing 16 people and sparking the massive wave of anti-corruption protests.

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