CAIRO, June 27 (Xinhua) -- Egypt's Prosecutor General Nabil Sadek ordered on Wednesday advanced technical examinations of camera footage of the Cairo metro system over the death of Italian researcher Giulio Regeni in Cairo in early 2016.

The examination tries to get first-hand information about the gaps in the surveillance camera footage of the Cairo metro on the day Regeni disappeared, official MENA news agency reported.

On Wednesday, Egyptian and Rome prosecutions issued a joint communique on examining the footage which revealed that they do not have the shots of Regeni due to gaps in the footage.

Regeni disappeared in Cairo on Jan. 25, 2016, and his tortured, half-naked body was found nine days later in a ditch on the outskirts of the Egyptian capital city.

His disappearance and murder took place amid intensive security deployment in Cairo and other major cities in Egypt ahead of the fifth anniversary of the Jan. 25 uprising that toppled former president Hosni Mubarak in 2011.

A few weeks later, the Egyptian police said they busted and killed a five-member gang in Cairo and found Regeni's handbag, passport and student ID card at the residence of a gang member's relative.

Egyptian President Abdel-Fattah al-Sisi repeatedly vowed to bring Regeni's murderers to justice, blaming "conspirators" who attempt to cause tension in Egypt's ties with Italy.