A second fire in one week broke out in the refugee camp on Samos on Sunday evening.
Two or three containers at the Samos centre were destroyed but no-one was injured, a police source said.
“There is no risk of the fire spreading,” a spokeswoman for the fire service told AFP.
Authorities believe the fires were intentionally set and police are now on the scene investigating.
Shortly before the fires, local health authorities located 21 cases of COVID-19 among migrants and refugees at the camp.
On Tuesday, a different fire was set in the camp after two cases of the virus were recorded there.
Police later detained two men, one from Syria and one from Gambia, for inciting criminal activity.
Allegedly, the men sent out messages on WhatsApp and Facebook urging people to set fires in the camp.
This comes after a series of fires that destroyed Moria, a refugee camp in Lesvos, in early September.