In a statement, the Nigerian Embassy in Rome confirmed the news.
"The incident occurred on a busy street, in front of shocked onlookers, some of whom recorded the attack, with little or no attempt to prevent it," according to the statement.
"His Excellency, Ambassador Mfawa Omini Abam, has condemned the heinous murder and expressed condolences to Mrs. Charity Oriachi, the deceased's wife, and the rest of his family."
"His Excellency has directed that appropriate immediate consular assistance be provided."
The Embassy stated that it is currently working with relevant Italian authorities to ensure that justice is served and that the deceased's family receives assistance.
"Ambassador Abam wishes to enjoin members of the Nigerian community in Italy to remain calm and refrain from taking the law into their own hands," according to the statement.
"His Excellency wishes to reassure Nigerians in Italy that citizen diplomacy remains the primary focus of his administration and that he will go to any length to ensure that all Nigerians in Italy receive timely, efficient, and professional consular services."