Rome, Jan 26 (IANS/AKI): Two years to the day after Italian researcher Giulio Regeni was abducted in Cairo and tortured to death, Italy's Prime Minister Paolo Gentiloni has pledged to keep seeking "the truth" in the horrifying case.

"January 25 - two years after Giulio Regeni's horrendous assassination we remain committed to finding out the truth," Gentiloni tweeted.

The 28-year-old Regeni's badly tortured and mutilated body was found on Cairo's outskirts in early February 2016, 10 days after he vanished while taking the subway to a friend's party in the centre of the city.

The Cambridge University doctoral student had been researching independent trade unions in the Egyptian capital as part of his thesis.

No arrests have been made over Regeni's disappearance and brutal killing.

The case severely strained bilateral ties and caused Italy to withdrew its ambassador to Egypt for 15 months in protest against the lack of progress in the investigation.

There has been widespread suspicion among Western diplomats and in the Italian press that Egypt's security forces were behind Regeni's savage murder - claims strenuously denied by the Egyptian government.