Greek police say about a hundred refugees have briefly blocked a key road in the northern city of Thessaloniki, demanding better health services in their state-run camp.

The protest followed the death of a Syrian woman who fainted while having a shower and was pronounced dead after she was taken to hospital on Thursday. Refugees are demanding that an ambulance be permanently stationed in the camp housing nearly 1,400 people.

Police said protesters peacefully returned to the camp after briefly stopping traffic on part of the Thessaloniki ring road.

About 57,000 refugees and other migrants are living in camps or rented accommodation across Greece, which is a major entry point for people seeking a better life in the European Union.