Three German Gruenhelme e.V. aid workers have been missing since May 19 in the town of Harem in northern Syria and are believed to have been kidnapped.
Syrian Army troops and pro-Iranian militias launch a major ground assault on a rebel-held enclave in the city of Daraa. Rebel forces say that they have repulsed the attack from the western side of the enclave. State media says that the army was preparing to end a "state of lawlessness and chaos" and "reimpose army control" in the city.
Airstrikes on Islamic State of Iraq and the Levant-controlled areas in Syria's eastern Deir ez-Zor Governorate, leaves at least 47 civilians dead, according to the Syrian Observatory for Human Rights.
A car bomb attack by unknown people near a Palestinian refugee camp in the Damascene suburb of Sbeineh ("Sabina") kills at least 15 people. AFP says rebels claim the capture of the village of Harem near Idlib on the Turkish border, after a 3-day siege; the government still keeps air supremacy. U.N. envoy Lakhdar Brahimi says it is both conflict parties' duty to try to reach peace.