Greece recovered the bodies of four dead migrants and rescued 27 others after their boat sank off the island of Kos in the southeastern Aegean Sea, the Greek coastguard said late on Tuesday.
Three coastguard ships and a commercial vessel were searching for more people in the area, it added.
In a separate incident early on Wednesday, a cargo ship rescued 96 migrants after their boat sank off the tiny island of Gavdos, near the island of Crete in the Mediterranean Sea, the coastguard said.
It said one of its vessels with four other ships and a helicopter were searching for any missing people amid moderate winds.
Greece was at the frontline of a migrant crisis in 2015-2016 when more than a million people, mostly Syrian refugees, crossed from Turkey to the country by sea, mostly on inflatable dinghies.
The number of arrivals fell before resurging last year as many migrants attempted the new southern route through Gavdos.
One of Afghanistan's worst earthquakes killed more than 800 people and injured at least 2,800, authorities said on Monday, as helicopters ferried the wounded to hospital after they were plucked from the rubble of homes being combed for survivors.
Israel pushed tanks deeper into Gaza City and detonated explosives-laden vehicles in one suburb as airstrikes killed at least 19 people on Monday, Palestinian officials and witnesses said.
India's Narendra Modi told Vladimir Putin on Monday that India and Russia stood shoulder to shoulder even in difficult times after the Kremlin chief cast the Indian prime minister as his "dear friend" and gave him a lift in his armoured limousine.
Chinese President Xi Jinping urged leaders to leverage their "mega-scale market", while Russian President Vladimir Putin showed support for Xi's ambition for a new global security and economic order that poses a challenge to the US during a regional summit on Monday.
South Korea has suspended a military radio broadcast that transmits to North Korea as part of measures aimed at easing tensions with Pyongyang, Seoul's defence ministry said on Monday.