Europe's largest migrant camp, Moria, has been "completely destroyed" after massive fires broke out early Wednesday at the overcrowded site on Greece's Lesbos island, according to an eyewitness.

Axar.az reports citing foreign media that firefighters are trying to contain the fire at the refugee camp, home to an estimated 13,000 people, more than six times its maximum capacity of 2,200 people.

There are no reports of injuries so far, and authorities have said they are still assessing the scope of the damage. George Moutafis, a photographer on the ground, told Greek TV channel Mega that the camp has been "completely destroyed."