BaniyasSyria arrested Ali Kayali, Turkish state broadcaster TRT World reported.
The Syrian Arab News Agency calls him main suspect in 2013 killings of hundreds of civilians.
A UN inquiry found forces shelled and entered al-Bayda on 2 May 2013, then Ras al-Nabaa, with no armed opposition present.
The General Intelligence Directorate says it caught him fleeing across the border, and names no trial court.
How each outlet framed it
drawn from 100+ reports worldwide
- TRT World
- ties the arrest to the 2013 Alawite massacres under Assad and cites UN Commission of Inquiry findings on May 2 to 3
Sources: TRT World