Six Afghan nationals were remanded in custody by order of a prosecutor on the island of Lesvos on Monday after being charged with arson and participation in a criminal group.
The six are suspected of having set fire to the Moria refugee camp in Greece earlier this month - which left almost 13,000 people without shelter.
Four of the six Afghans are aged 19 and two are 17.
The defendants denied the charges against them and claimed they fell victim to the testimony of a fellow Afghan who also lived at the Moria camp.
They said he had reason to present them as arsonists because of tribal differences.
But according to Greek media reports, a video had reportedly helped police identify one of the suspected arsonists.