The prosecutor said police in the capital, Ankara, had started legal proceedings on Tuesday morning and search-and-detention operations were going on in eight provinces.
The head of the TTB, Rasit Tukel, and other members of the board had been detained, opposition Republican People's Party (CHP) lawmaker Ali Seker said on Twitter.
Pressing Syria offensive, Turkey urges US pullback
The Turkish Medical Association denounced the cross-border operation into Syria’s Afrin last week, saying “No to war, peace immediately”.
President Tayyip Erdogan accused the union of treason on Sunday and more than 300 people have since been detained for social media posts criticising the offensive in Syria.
“Believe me, they are not intellectuals at all, they are a gang of slaves. They are the servants of imperialism,” he told Justice and Development Party (AKP) members in the northern province of Amasya.
“This ‘No to war’ cry by this mob ... is nothing other than the outburst of the betrayal in their souls ... This is real filth, this is the honourless stance that should be said ‘no’ to,” Erdogan said.
COMMENTS
Comments are moderated and generally will be posted if they are on-topic and not abusive.
For more information, please see our Comments FAQ