According to official figures released on Tuesday more than 500 migrants reached islands of the eastern Aegean in the previous four days, following a two-week lull in arrivals.
The spike in arrivals was attributed by a Greek Police official to Turkish authorities, who, he said, control the influx.
“But they always make sure not to overdo it so they can claim they are honoring the joint EU-Turkey agreement,” the official said, referring to a deal signed between Brussels and Ankara in March 2016 to curb human smuggling.
The two-week drop in arrivals eased the pressure on facilities, as did the transfer of migrants to camps on the mainland. But some camps, notably on Lesvos, remain overcrowded.