The expulsions will have a significant impact on the entire humanitarian operation for Syria, Amos wrote.
IS began abducting the Assyrians on Monday, when militants attacked a cluster of villages along the Khabur River.
Syrian Kurdish forces advanced against Islamic State fighters in two separate attacks in northeastern Syria near the Iraqi border.
The mission was successfully completed, with the troops brought back to Turkey.
Staffan de Mistura will send a team to Aleppo by the end of this month to assess the conditions for the freeze.
The three teenagers flew to Turkey from a London airport, without leaving any messages for family or friends.
UN chief Ban Ki-moon called for urgent action to lift sieges on civilians and to end barrel bomb attacks.
Islamic State group is struggling in Syria where it has stalled or even lost ground while fighting multiple enemies on several fronts.
Syrian government to suspend airstrikes and artillery shelling on Aleppo to allow a proposed UN plan to “freeze” hostilities in the city.
The photojournalist who was barred said that the freedom to report, the freedom to cover news might be harmed.
Austin Tice disappeared in August 2012 while covering the civil war in Syria.
China has expressed concern about the rise of IS, nervous about the effect it could have on Xinjiang region.
Bavarian woman arrested for charges with preparing an act of violence in Syria.
Condemning what it described as the “heinous” killing of a Jordanian pilot by militants, Syria asks for the country’s military assistance.
The Pentagon said this week the militants had been driven out of 90 percent of Kobani.