The Greek Coast Guard rescued 36 migrants from a dinghy off the northwest coast of the island of Lesvos on Sunday.
The migrants - 16 men, 10 women (among them 2 pregnant) and 10 minors - from Iran and Afghanistan were transported to the port of Petra for a medical check, before being taken to the Megala Therma camp, northern Lesvos, where they will be quarantined.
The Regional Authority of the Northern Aegean said on Monday that it was taking legal action against a nongovernment organization called Moria Corona Awareness Team after it referred to "the Greek side of the island" of Lesvos in a post on its Facebook page last Thursday, thereby implying that there is a non-Greek side of the island.
Authorities are concerned over a possible spike in migrant inflows after a third boat arrived on the eastern Aegean island of Lesvos since the beginning of May on Sunday, with 36 people on board from Afghanistan and African countries.
The migrants were transferred to a makeshift structure in Megala Therma for 14 days of quarantine.
Migration Minister Notis Mitarakis has argued that his ministry needs "flexibility" in dealing with Greece's migrant crisis since neighbouring Turkey abandoned a 2016 deal with the European Union in late February and lifted restrictions on migrants and refugees from the Middle East, Asia and Africa trying to reach the bloc via its territory.
Athens is on alert over attempts by Ankara to press a revisionist agenda, most recently by issuing navigational warnings (NAVWARNS) which were seen as an attempt to obstruct the Greek naval training exercise "Kataigida '20" that was originally scheduled to begin Monday.
All military exercises were postponed over the weekend amid concern over the spread of coronavirus.
The tension was palpable at the weekend at migrant facilities on the eastern Aegean islands of Lesvos, Samos and Chios, with asylum seekers frustrated as they are not permitted to move outside the camps and are forced to wait in line for hours for food as a result of the problems created by the coronavirus restrictions.