Egyptian security forces on Thursday arrested the Cairo bureau director of Iranian satellite TV news channel Alalam.
"Security forces raided the home of Ahmed al-Siyoufi and arrested him," a security source told Anadolu Agency.
The reason for al-Siyoufi's arrest, however, remains unclear.
The news channel confirmed the arrest, saying talks were currently underway with Egyptian Journalists Syndicate head Diaa Rashwan to determine the reason for al-Siyoufi's sudden arrest.
Egypt's "Journalists for reform" group, meanwhile, condemned the arrest as a "new blow to journalists."
In a statement, the group described al-Siyoufi – an Egyptian national – as "an outspoken opponent of the [July 3] coup" that unseated elected president Mohamed Morsi and "a staunch supporter of constitutional legitimacy."
Egyptian security forces had briefly detained al-Siyoufi in July and confiscated broadcast equipment from Alalam's Cairo office on allegations that the channel lacked official permission to operate in Egypt.