In Syria, the government's air defenses have shot down missiles over its two airbases early Tuesday.
The same airbase was hit by a USA missile strike in April, 2017 over allegations of chemical weapons' use by the Syrian army in Idlib province in the same year.
A top Russian chemical weapons protection expert, Igor Kirillov said experts from Organization for the Prohibition of Chemical Weapons are set to visit Douma tomorrow.
Unconfirmed reports said that Syrian air defenses had also intercepted three missiles aimed at Dumair military airport north east of Damascus.
"There is no USA military activity in that area at this time", Eric Pahond, a Pentagon spokesman said.
The United States previous year targeted the Shayrat airbase with cruise missiles in response to a sarin gas attack on the rebel-held town of Khan Sheikhun.
There has been speculation that Israel launched the strikes.
Israeli interventions: Tel Aviv has carried out multiple airstrikes on Syrian government targets during the conflict.
Before the US -led attack, Israeli warplanes had fired missiles on the T-4 airbase in the eastern countryside of Homs on April 9, killing 14 soldiers, including Iranian fighters.
Following reports of an Israeli strike, an Israeli military spokesman said: "I'm not aware of such an incident".
With flags of Syria, Russia, Iran, Hezbollah and Cuba, the assembled, among them young people and women, denounced in a combatant march that the United States and its lackeys of United Kingdom and France bite the dust of the defeat when suffering the demolition of their missiles. Israel did not confirm or deny mounting the raid.