Two firefighting helicopters collided during a wildfire response operation in Greece, killing two crew members.
The fatalities were a Danish national and a Greek national, while two people aboard the second helicopter survived.
The precise roles of those killed are unclear: one account described the Greek victim as a fire-service liaison officer, while another referred to both people killed as pilots.
The fire service said the collision occurred near Psatha, northwest of Athens, as crews worked to contain a wildfire.
One helicopter caught fire and crashed into a ravine after the collision, while the other made an emergency landing.
The fire service said it had opened an investigation into how the crash occurred.
Wildfires had spread across parts of Greece, prompting evacuations in some areas.