Hamas police initiated a manhunt for people involved in the murder. Hamas authorities sealed off parts of the Gaza Strip before the beginning of the operation, during which gunfire and at least one explosion were heard. Hamas security forces laid siege to a house where the suspects were staying, in the
Nuseirat refugee camp, in central Gaza. The suspects refused to surrender and a gun battle ensued. Hamas policemen entered the home and killed Balal al-Omari and a Jordanian, Abbad a-Rahman al-Brizat (one of the two dead men may have committed suicide). A third suspect, Mahmoud al-Salfiti, was wounded and detained. Three of the suspects' associates were also captured. Hamas Interior Ministry spokesman
Ihab al-Ghussein reported that five Hamas policemen were injured, as well as a girl who was caught in the crossfire. The four extremists captured in the raid were charged over Arrigoni's abduction and murder in a Hamas military court. The trial was presided over by military judge Abu Omar Atallah. They were found guilty in September 2012. Mahmoud al-Salfiti, 28, and Tamer al-Hasana, 27, were sentenced to life imprisonment with hard labor: the court refrained from imposing the death penalty on them after Arrigoni's parents urged that they be spared. Khader Jram, 24, was sentenced to 10 years imprisonment and Amer Abu Ghouleh, 23, was given a prison term of one year for sheltering fugitives. Following an appeal, a military court reduced the sentences of Salfiti and al-Hasana from life to 15 years on 19 February 2013. "We asked in our appeal for the conviction for murder and abduction to be dropped to only abduction," their lawyer Mohammed Zaqut said. In June 2015, after being granted a furlough from prison, Mahmoud al-Salfiti managed to escape from Gaza to
Iraq, where he joined
ISIS. On 28 November 2015 he was reportedly killed fighting for ISIS in
Anbar province. ==Reactions to death==