Among those hospitalized were a pregnant woman, a person in generally poor condition, and a person who was thought to have a broken ankle and suffered from severe hypothermia.
In a separate report, ANSA said that nine out of 15 migrants were Iraqi, four were Syrian, and one was Iranian, and the identity of the person who was hospitalized due to hypothermia could not be determined yet.
Italian Defense Minister Guido Crosetto told reporters that the stowaways, who he described as a group of "illegal migrants" with "dagger-type weapons," took control of the Turkish-flagged Galata Seaways ro-ro ship, which was sailing from Türkiye's Yalova province to the French port of Sete.
Following the operation by two navy helicopters, coast guard personnel and customs police, control of the ship was regained off Naples.
"The ship's hijackers have been captured. All ended well," Crosetto wrote on Twitter and congratulated security forces taking part in the operation to regain control of the ship.
Türkiye's General Directorate of Maritime Affairs (DGM) said relevant authorities were alerted at 11.20 a.m. Turkish time (0820GMT) that 15 stowaways with dagger-type knives were detected onboard.
Following evaluations, Turkish authorities contacted Italian and French authorities, and upon the request of the ship's company and approval from Rome, it was decided that the ship sail toward Naples, the DGM said in the statement.