Protesters have left red handprints at the entrances of government buildings in the Serbian capital Belgrade to demand the arrest of officials just days after a concrete canopy collapsed at a railway station, killing 14 people and injuring three. Police formed a cordon outside the Ministry of Construction and Infrastructure in central Belgrade as several thousand people called for ranking government ministers, including Prime Minister Milos Vucevic, to immediately step down. “What we pointed out today is the responsibility, responsibility of those sitting in the government and ministries that …