Reports said early May 5 that Israel conducted an airstrike against what is believed to be a chemical weapons development facility in northern Syria.
Syria's state-run media reported that the attack took place shortly before midnight near the city of Aleppo.
According to Reuters, western intelligence and opposition sources suspect that Syria is using the Scientific Studies and Research Center for development of chemical weapons with help of Iranian researchers.
The head of the Syrian Observatory for Human Rights (SOHR) said there was a great amount of damage and an ammunition dump was destroyed. He added that Syrian and Iranian troops had been present at the facility.
Russia's Sputnik news agency quoted a Syrian defense source as saying that planes flew from the airspace of the US military's a-Tanf base on the Syria-Iraq border and attacked from an area under control of US-backed forces east of the Euphrates River.
Meanwhile, the SOHR said unidentified drones attacked Iranian targets in city of al-Miyadin, a suburb of Deir Az-zour in eastern Syria. There was no immediate confirmation from any other source.