A senior al-Jazeera journalist was arrested in Germany, after Egypt issued an international arrest warrant.
Ahmed Mansour was sentenced to 15 years in absentia, by a court in Egypt, which found him guilty of torture.
In a video recorded while detained, Mr Mansour, who works for the channel's Arabic service, described the incident as a "misunderstanding" and said he hoped it would be resolved quickly.
"It is quite ludicrous that a country like Germany would enforce and support such a request made by a dictatorial regime like the one we have in Egypt," he added.
"Other countries must not allow themselves to be tools of this media oppression, least of all those that respect freedom of the media as does Germany," said al-Jazeera acting director General Mostefa Souag.