This footage shows Czech Black Hawk helicopters dumping water on a wildfire burning in a Serbian nature reserve.
The footage was released by the Czech contingent on 23rd August and shows the operation over the Deliblatska Pescara reserve, in north-eastern Serbia.
The video shows the helicopters running in low over the burning scrub and pine, releasing their loads and turning back for another lift.
The Czech team said: "We're flying under the leadership of a Serbian helicopter in close coordination with teams from Slovakia and Romania."
The two aircraft flew their first day over the fire on Sunday, 23rd August, joining Romanian and Slovak crews that had started the day before.
Serbia triggered the EU Civil Protection Mechanism on Friday after weeks of fighting the blaze, which has burnt through thousands of hectares of pine since late July.
Four Black Hawks were sent from Romania, Slovakia and the Czech Republic, along with 55 firefighters and 24 vehicles from Germany and 69 firefighters and 15 vehicles from Romania.
Andreas Beckerath, head of the EU mission to Belgrade, said: "We stand with Serbia in protecting lives, livelihoods and the unique natural heritage of Deliblatska Sands."
Luka Causic, who heads the Serbian emergencies department, said the situation had steadied by Saturday but that strong winds were forecast.
He said the priority remained protecting settlements and human lives as conditions were expected to worsen.
Deliblatska Pescara is the largest expanse of inland sand dunes in Europe and is protected as a special nature reserve and important bird area.
It lies about 80 kilometres (50 miles) east of Belgrade and is sometimes described as the European Sahara.
Other blazes were burning in the Stolovi mountains in south-western Serbia and across the border in North Macedonia.
(Joe Golder/Clipzilla/NX)