Original sentence: Although the event was announced, the embassy was allegedly left unguarded by the Serbian police, with only undercover security units present, which sparked criticism from Montenegro.On 2 January 2020, several thousand fans of the Belgrade sports club Red Star marched to the Montenegrin embassy in Belgrade to support the protests in Montenegro against the law, setting off fireworks that partially burned the flag of Montenegro outside the embassy building.President of Serbia Aleksandar Vučić denied these claims and stated that the embassy was well-guarded
Edited sentence: Although the event was announced, the embassy was left unguarded by the Serbian police, with only undercover security units present, which sparked sharp criticism from Montenegro.On 2 January 2020, several thousand fans of the Belgrade sports club Red Star marched to the Montenegrin embassy in Belgrade to support the protests in Montenegro against the law, setting off fireworks that burned the flag of Montenegro outside the embassy building