Italy's Interior Minister Matteo Salvini has accused some migrants of hijacking the ship that rescued them off the Libyan coast, BBC reports.
It is alleged that in order to avoid being returned to Libya, at least two passengers forced the ship to turn away from the inbound Libyan coastguard.
The 67 passengers were eventually handed over to the Italian coastguard.
Mr Salvini called two suspects "violent hijackers, who will have to get off the Diciotti ship in handcuffs".
Details of the incident remain unclear, but Italian media report that police boarded the coastguard vessel Diciotti to quiz its passengers.
They focused on two people in particular - one Ghanaian and one Sudanese - but did not uncover concrete evidence of a violent crime.
Officers then travelled to international waters to speak to the crew of the Vos Thalassa, the original rescue vessel which was supposedly hijacked, La Repubblica newspaper reported.