Many are still missing, according to witnesses, and the coastguard has launched a search operation assisted by vessels and aircraft since they were alerted about the incident on Friday night.

In separate incidents on Saturday, a Malta-flagged cargo vessel rescued 47 migrants from a boat sailing about 40 nautical miles off Gavdos, while a tanker rescued another 88 migrants some 28 nautical miles off the tiny island in Greece’s south.

According to initial information, coastguard officials believe the boats left together from Libya.

Greece was a favoured gateway to the EU for migrants and refugees from the Middle East, Africa and Asia in 2015-2016, when nearly 1 million people landed on its islands, mostly via inflatable dinghies.

Incidents with migrant boats and shipwrecks off Crete and its tiny neighbour Gavdos, which are relatively isolated in the central Mediterranean, have increased over the past year.