Improvement work has begun at an overcrowded refugee camp on the Greek island of Lesbos, following the deaths of three migrants in Moria camp over the last week.
The deaths have raised the alarm about the harsh winter conditions in the over-crowded camps.
Teams of workmen could be seen in the camp on Thursday.
Two migrants were found dead in their tents last week.
The 22-year-old Egyptian and a 46-year-old Syrian, who shared a tent, died days apart. A third died on Monday, believed to be a 20-year-old from Pakistan.
Another migrant who shared his tent is critically ill and has been taken to hospital.
The Greek media have suggested they were poisoned by fumes from stoves lit inside the tents to combat the bitter winter temperatures.
However, the authorities would neither confirm nor deny this.
