World Bulletin / News Desk
Refugees at a camp on the Greek island of Lesbos hurled stones at police and torched seven temporary offices used by asylum officials in an hour-long protest on Monday over conditions, officials said.
"Incidents have occurred in the past but this is the most serious one," Carreira told AFP.
"We are looking into ways of guaranteeing that this might not happen again," said Carreira, who is in Athens for meetings with Greece's immigration ministry.
EASO staff left the scene, Carreira said, and no one was hurt in the incident as the blaze was quickly brought under control by firefighters.
However, it could take days before asylum interviews can resume, he added.
Around 70 refugees took part in the protest, most of them from Pakistan and Bangladesh, a local police source said. Police made a dozen arrests.
The incident took place at the Moria camp, one of five centres on Greek Aegean islands, which have borne the brunt of Europe's refugee crisis.
More than 15,000 refugees are being held on the Aegean islands, pending their return to Turkey under an EU-Turkish agreement reached in March this year.
Processing has been held up because the vast majority have filed for political asylum.
Moria has a capacity for 3,500 people but currently houses more than 5,000.
Part of the camp was badly damaged in a fire on September 19 during clashes between refugees and police, and thousands had to be moved out before returning two days later.
Nearly 66,000 refugees and refugees are currently stranded in Greece, according to official figures.Last Mod: 24 Ekim 2016, 17:19