The Czech police are also still looking for the girl Julia from Germany who is missing in the border area with Bavaria.
On Tuesday, the authorities called on all citizens who had been on the Cerchov mountain and its surroundings between 3 p.m. and 7 p.m. on Sunday to report immediately to the police emergency number.
Domazlice - Eight-year-old Julia disappeared two nights in the border area between Bavaria and the Czech Republic.
The family from the greater Berlin area hiked up the mountain Cerchov (Schwarzkopf), which is a few kilometers from Waldmünchen in Bavaria, at the weekend.
The heavily forested terrain with rocks and gorges is considered impassable and sometimes dangerous.
The police released a video showing emergency services combing the forest in a long line.
A helicopter with a thermal imaging camera was also in use.
The area near the border was a restricted military area during the Cold War.
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On the Czech side, too, the police advised volunteers not to take part in the search.
Should that change, they will get in touch.
"Thank you for not being indifferent," wrote a spokesman on Twitter.
dpa