The Italian prime minister said the taking of the hostages will not stop the attempts at peace in Iraq.
Earlier the Italian foreign minister said the kidnappers were not linked to any other major group in Iraq.
On Wednesday Russia offered to fly 800 of its people out of Iraq as the number of kidnappings grew.
Other governments have also recommended that their citizens in Iraq try to leave the country.
The Italians, who are security guards working for a US-based company, were abducted on Monday.