Rescuers find 13 bodies, including pregnant women, in crowded dinghy off Libya

"Thirteen corpses in total. People who had names, surnames, mothers, fathers, friends, and lives," said Proactiva Open Arms, a Spanish NGO involved in rescues in the Mediterranean, on Twitter.

"We have found 167 people drifting," it said earlier noting that "several pregnant women and mothers" were among an initial toll of 11 dead and that their relatives were on board.

The Italian coastguard confirmed the deaths and said worsening weather conditions at sea were likely to dissuade traffickers for now from setting more boats full of people to sail in the Mediterranean.

Close to 94,000 people have been brought to safety in Italy so far this year, according to Italy's interior ministry, an increase of over five percent compared to the same period last year.

At the same time over 2,370 people have died attempting the notoriously perilous crossing, the UN refugee agency said.

The fresh deaths came as Italy's Interior Minister Marco Minniti was due to meet with NGOs to discuss a new "code of conduct" to regulate the operations of privately run rescue boats.

The 12-point code, which has been given the green-light by Brussels, would ban aid vessels from entering Libyan territorial waters and oblige them to accept anti-trafficking police officers on board.

While some of the NGOs operating in the Mediterranean have agreed to sign the code, others have insisted doing so would put the lives of vulnerable migrants at sea in flimsy vessels at risk.

Minniti has insisted that those who do not sign the document will not be allowed to dock at Italian ports.

Although Italy has repeatedly stressed that it will continue to save lives at sea, Rome has upped its requests for fellow European states to help shoulder the load – particularly in terms of providing shelter to those rescued.