19 men arrived in batches at the Turkish border earlier last month on pretext of taking part in the New Year's celebrations, said the Syrian Observatory for Human Rights, a UK-based watchdog group that relies on a network of activists on ground.The groups gradually moved to a Turkish border point, adjacent to the northeastern countryside of Syria's northern province of Aleppo, where they assembled and entered the Syrian territories in two groups through Aleppo's northeastern town of al-Rai, which is under the IS control, according to the Observatory.Both groups reached the city of al-Bab in northern Aleppo, where the IS militants bused them to the IS defacto capital of al-Raqqa in northern Syria to join the IS training camps, said the Observatory.