Syrian journalist and activist Rami Jarrah was released Saturday from Turkish detention, after being held for three days.
"Unfortunately to this moment I have not received a direct or official explanation of why I was arrested and what I was being charged for," he wrote on Facebook.
He indicated the detention was related to his crossing into Syria for a reporting trip. The journalist left Aleppo and came back to Turkey in January.
Jarrah said he was held with terror suspects, some of whom were being detained without charge for nine months.
Jarrah, who was raised in Britain, has regularly reported from opposition-held areas of Syria.
In January, after leaving Aleppo, which is currently facing a heavy air offensive by Russia, Jarrah was invited as a guest to the presidential palace in Ankara by Turkish President Recep Tayyip Erdogan and posted a selfie from the event.