On the evening of 4 May 2023, a shooting spree occurred in the villages of Dubona and Malo Orašje, between Mladenovac and Smederevo, Serbia.

Armed with an automatic assault rifle, the shooter opened fire from a car, resulting in the deaths of nine individuals, including an off-duty police officer, and leaving twelve others injured.

Following the incident, Blažić's father, uncle, and first cousin were also taken into custody, facing charges related to criminal possession of a weapon.

[4][5] In 2021, with an estimated 39 privately owned guns per 100 people, Serbia was the third-ranked country globally in this statistic, behind the United States and Yemen.

He shot 11 friends who were having a barbecue in the centre of the village, near the football field and the war victims' monument.

[20] After the shootings, Blažić left his car and stole another in Dubona, driving to the tollbooth near Mali Požarevac.

[23][24][25][26] According to Blic, the taxi driver told the Prosecutor's Office that he received a call from the dispatcher with a ride to the vicinity of Ub.

While he was driving a female passenger, he turned off the highway at the Mali Požarevac tollbooth due to the presence of police vehicles.

At the toll booth, Blažić was disturbed by the presence of police officers and ordered the taxi driver to drive without stopping and with the fuse on.

[35][36][37][38] One of the wounded from Malo Orašje, a 26-year-old man, died more than a month later, on 23 June, bringing the number of deaths to nine.

[21] According to Serbian media, police officers set up checkpoints and stopped cars as they searched for the gunman.

[11] Grujičić and the head of the Security Intelligence Agency, Aleksandar Vulin, reportedly travelled to the area.

[52] In his testimony, Blažić tried to justify his massacre by claiming that he suffered bullying in primary school and that the villagers "taunted him and plotted against him" and allegedly spoke severely about his father, including that he was a "criminal".

[77] On 26 June, the Higher Public Prosecutor's Office in Smederevo ordered a mental status examination for the father.

[81][82] On 26 May, the High Court also issued a judgment to keep the uncle in custody for 30 days because he would interfere with the proceedings by influencing the witnesses.

[72] On 11 June, the police arrested Blažić's 19-year-old first cousin while the High Court issued a judgment to keep him in custody for 30 days.

[86] As of 29 June, 48 witnesses were brought in for questioning or gave their testimony, including family members of the victims, eyewitnesses, and others.

According to neighbors, Blažić was known for his arrogant and aggressive behavior, as well as for the fact that he was never held accountable for his misdemeanors, since he was protected by his father.

On 28 July 2019, a misdemeanour charge of insolent behaviour was filed against him after he used a chainsaw to cut the ramp used by a Dubona local to protect the entrance to his property.

However, he did not pass the Military Security Agency (VBA) background check due to previous misdemeanour proceedings for violent behaviour.

[93] On 17 June 2023, Blažić fought with another detainee after returning to the Smederevo detention from the Special Prison Hospital in Belgrade.

[97] On 1 August, firefighters extinguished a fire at the cottage in Šepšin where Blažić had weapons stored prior to the attack.

[99] Interior Minister Bratislav Gašić and President of Serbia Aleksandar Vučić denounced the shooting as a terrorist act.

[42][100] At a press conference on 5 May, Vučić announced new measures and added that Blažić "will not see the light of day again", that "he will not get out of the prison", and that all people with weapons will undergo an audit.

[106] On 8 May, the Serbian Ministry of Internal Affairs offered a one-month amnesty for surrendering illegal or unregistered weapons and ammunition.

The ministry reported that citizens handed over 78,302 firearms, 4,085,000 rounds of ammunition, and 25,914 pieces of ordnance by the end of the call.

[112] The protestors met in front of the country's parliament before marching in silence through the streets near Serbian government offices to demand the resignation of Vulin, Gašić, the Minister of Education Branko Ružić, and the council of the Regulatory Authority for Electronic Media [sr], as well as cancelling programmes that promote violence and shutting down media and tabloids that publish false news and violate the Journalistic Code.

[116] The second protest was held on 12 May; it began in front of the National Assembly of Serbia building while the demonstrators continued walking to the Gazela Bridge and ended at Sava Centar.