Al Jazeera has urged Germany to immediately release its journalist Ahmed Mansour, who was detained at a Berlin airport at the request of the Egyptian authorities.

“The crackdown on journalists by Egyptian authorities is well known. Our network, as the Arab world’s most-watched, has taken the brunt of this. 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,” Acting Director General of Al Jazeera network Mostefa Souag said.

“Ahmed Mansour is one of the Arab world’s most respected journalists and must be released immediately.”

Mansour, a senior Al Jazeera Arabic TV journalist, was arrested at Berlin’s Tegel airport at 13:20 GMT on Saturday as he tried to board a Qatar Airways flight from Berlin to Doha.

In a phone call, Mansour told Al Jazeera that he would remain in custody until Monday when he will face a German judge who will decide on his case.

Mansour was sentenced in absentia to 15 years in prison by Cairo’s criminal court in 2014 on the charge of torturing a lawyer in Tahrir Square in 2011.

He denied the charges. And in October last year, Interpol rejected Egypt’s request for an international arrest warrant against him.

Al Jazeera dismissed the accusation as a flimsy attempt at character assassination against of one of its leading journalists.

Terrorise Al Jazeera journalists

The arrest of Mansour comes two weeks after Egyptian President Abdel Fattah el-Sisi visited Germany.

Sisi has largely suppressed dissent in Egypt. Thousands of activists and political opponents have been arrested, prosecuted and in some cases sentenced to death since former President Mohamed Morsi was deposed two years ago.

Mansour’s lawyer, Saad Djebbar, told Al Jazeera that his client’s arrest was politically motivated.

“This is a ploy to terrorise Al Jazeera journalists and paralyse Al Jazeera from doing its work.”

Three Al Jazeera English journalists were wrongly accused of colluding with the banned Muslim Brotherhood.

Peter Greste was deported in February after 400 days in detention, while two of his colleagues, Baher Mohamed and Mohamed Fahmy, face a retrial. Al Jazeera