Militants from the Islamic State executed at least 20 men accused of being government supporters, shooting them dead inside an ancient amphitheatre in the Syrian city of Palmyra.
Syrian Observatory for Human Rights
Syrian authorities have said that Islamic State militants have killed at least 400 people, including women and children, in Palmyra.
Islamic State militants have shot dead 23 civilians, including nine children, as fighting continues over the ancient city of Palmyra, in Syria.
A senior officer in the Syrian army has been wounded in a rebel bombing attack in a central district of the capital, Damascus.
A suicide bomber has detonated explosives in a central neighbourhood in Damascus, the capital of Syria, near major security compounds.
The death toll of an airstrike by US-led forces on the northern Syrian province of Aleppo has risen to 52 civilians, including seven children.
A strategically important town in Syria, Jisr al-Shughour, has been seized by Syrian rebel forces, including militants from the al-Qaeda affiliate Nusra Front.
As many as 300 Syrian Kurds have been kidnapped in northern Syria by militants from the official Syrian wing of al-Qaeda, Nusra Front, a Kurdish official has said.
Islamists fighting in Syria have made a rare prisoner exchange in the five-year conflict, exchanging 25 women and children prisoners for the release of a senior commander.
At least 30 people have been killed in an attack on a village in Syria by suspected Islamic State militants, part of a pattern of attacks by the group on government-held positions in western Syria.