Bashar al-Assad army troops' attacks on cities in areas under the opposition's control killed 35 people Tuesday, according to the Syrian Observatory for Human Rights Organization.Twelve people were killed in Hama, 9 in the suburbs of capital Damascus, 7 in Aleppo and one person in Idlib, Deir ez-Zor, Daraa and Latakia each, according to the organization.Meanwhile, the General Council of the Syrian Revolution, a coalition of around 40 opposition groups, said in a statement that the militant group ISIS attacked a military airport in Ar-Raqqah, using heavy weapons.The statement also said that clashes occurred between the ISIS and units linked to the Islamic Front in the north of Aleppo.