An Iraqi girl aged two was killed on Monday after being struck by a car outside the Vial migrant camp on the eastern Aegean island of Chios.
The accident, which involved a car belonging to a non-government organization operating at the camp, occurred shortly after noon.
An investigation was under way to determine the exact circumstances of the incident.
Residents of Chios early on Monday blocked the road leading to the island's Vial reception facility in a protest against the camp's growing migrant population.
The residents have said that they will scale up their protests if central government authorities do not extend an operation to decongest the camps on Lesvos and Samos to their island too.
Nearly 800 migrants reached the islands of the eastern Aegean in the space of 48 hours, according to official figures made public on Wednesday.
A total of 795 migrants arrived on Lesvos, Chios and Samo on Tuesday and Wednesday, as human traffickers continue to exploit the good weather to intensify their activity.