Latvian authorities are hunting a 26 kg drone that disappeared midway through the flight, causing air traffic problems.
The aviation authority has restricted flights below 19,500 feet (6,000 m) in the region while searching for it.
While officials say the drone, which took off on Saturday, is likely to have landed, it had enough fuel to fly until 19:10 local time on Tuesday (17:10 BST).
Many members of the public have reported sightings, but none have been confirmed.
The non-military drone belongs to a local manufacturer of unmanned aerial vehicles (UAVs).
During a test flight, the company lost communications with the drone and lost track of its location, according to Latvian media reports.
About 3.5 m long and 5.5 m wide, with a speed of up to 70 km / h (43 miles per hour), it was last seen flying at about 200 m.
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On Monday evening, the aviation authority said that the possibility that the drone was no longer flying was becoming more and more likely, but more planes were still looking for it.
Despite the lower air traffic in Europe due to the coronavirus pandemic, the incorrect UAV caused some problems, closing the airspace above the Riga international airport and causing the redirection of a flight from China to Tallinn.
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