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.
U.S. President Donald Trump fired General Timothy Haugh as director of the National Security Agency on Thursday, according to two officials familiar with the decision, and congressional Democrats denounced the removal of the nonpartisan official from a top security post.
Israel stepped up airstrikes on Syria, declaring the attacks a warning to the new rulers in Damascus as it accused their ally Turkey of trying to turn the country into a Turkish protectorate.
The Trump administration moved forward with the sale of more than 20,000 US-made assault rifles to Israel last month, according to a document seen by Reuters, pushing ahead with a sale that the administration of former president Joe Biden had delayed.