A large fire broke out at Moria, Europe's largest refugee camp on Lesbos in Greece, forcing thousands including many families with children out into the streets with nowhere to sleep.
A second fire aggravated the crisis on the island of Lesbos, where authorities have declared a state of emergency.
The first blaze, which began hours after 35 people tested positive for coronavirus at the Moria camp, sent thousands fleeing for safety into surrounding olive groves -- but nobody was seriously hurt.
While European countries from Germany to Norway -- along with EU chiefs -- responded with offers of help, Greek officials sought to blame migrants for the fire.
Stopping short of alleging arson, Prime Minister Kyriakos Mitsotakis said the blaze was down to a "violent reaction" in the camp to virus testing.
Officials have declared a four-month emergency and flown in riot police after reports that security forces had blocked migrants from reaching Mytilene.
The fire at Moria -- which houses more than 12,000 people but was designed for just 2,800 -- raised questions about Europe's asylum system, with Germany leading the way in calling for an overhaul.
The first fire destroyed the official part of the camp, which housed roughly 4,000 people, ministers said. Another 8,000 lived in tents and makeshift shelters around its perimeter, many of which were badly damaged.