The Tomahawk cruise missiles were being driven from the USS Monterey warship on April 14, 2018.
The combined military forces of the United States, Britain and France say they have attacked a number of locations in Syria. In total they claim to have sent 105 missiles.
US Defense Secretary Jim Mattis said the United States and its allies had taken "appropriate action" against the Syrian government's "chemical weapons infrastructure".
The series of attacks came a week after alleged chemical attacks on Douma - a city controlled by insurgent groups.
However, the administration of President Bashar al-Assad denied ever using chemical weapons. As for Russia, Syria's main ally, said the alleged evidence of an assault on Douma underlying the onslaught to Syria was "deliberately made".
What is targeted in the onslaught to Syria?
Chairman of the US Joint Chiefs of Staff, General Joseph Dunford, claimed the allies had launched a series of missiles that hit and destroy three targets "specifically related to the Syrian regime's chemical weapons program".
The missiles were deployed from a number of jet fighters and several warships in the Red Sea, north of the Gulf, and the eastern Mediterranean Sea.
1. Barzeh research and development center, Damascus
The institute which is a branch of the Center for Research and Science Studies (SSRC) is located in Barzeh District, north of the Syrian capital.
According to General Dunford, the agency serves as a "research, development, production and testing center for chemical and biological weapons technology".
Lieutenant General Kenneth McKenzie, director of US Joint Military Staff, said 76 missiles had been directed to the site. Details, 57 Tomahawk cruise missiles and 19 missiles fired from the plane.
"The preliminary review is that these targets have been destroyed, so Syria's chemical weapons program will retreat a few years back," he said.
The Syrian government news agency reported a number of missiles had landed at the SSRC site so "destroyed a building, including a science laboratory and training center".
SSRC is a government agency officially assigned to develop and coordinate science activities in Syria.
However, an intelligence agency from one of the Western countries told the BBC in May 2017 that the SSRC branch in Barzeh-then one in Dummar (Jamraya) and another in Masyaf, Hama Province-was used to produce chemical and biological weapons as well as violating the Chemical Weapons Convention CWC).
The intelligence agency alleged that the facility at Barzeh was specifically used to install chemical weapons loads on long-range missiles and artillery.
The ammunition-making and maintenance activities took place in a closed section that escaped the reach of the OPCW inspectors (the Organization for the Prohibition of Chemical Weapons).
The US has actually imposed economic sanctions on 217 SSRC employees called "having chemistry and related disciplines and / or been working on SSRC chemical weapons program since at least 2012".
Despite these allegations, the OPCW reported that it has conducted two checks at the Barzah and Dummar facilities (also known as Jamraya) in February and November 2017.
From these observations, the OPCW claims to have found no "activity that is inconsistent with the obligations as regulated by CWC".
2. Chemical weapons storage location of Him Shinshar, west of Homs
Chairman of the US Joint Chiefs of Staff, Gen. Joseph Dunford, said that the United States believes this is "the main location for making Sarin in Syria and its raw material production equipment".
Lt. Gen. Kenneth McKenzie, director of the US Joint Chiefs of Staff, counted 22 missiles on this location with details of nine US Tomahawk missiles, eight British Storm Shadow missiles, and five SCALP cruise missiles and two French SCALP missiles.
The Ministry of Defense said the facility was used to "store chemical raw materials in violation of Syria's obligations under the Chemical Weapons Convention".
Chemical raw material at the location is suspected to produce toxic gas like Sarin.
"Using very careful scientific analysis, the best locations are targeted for Storm Shadows to maximize the destruction of chemical stocks while minimizing the risk of contamination in the surrounding areas," the British Ministry of Defense said.
The Syrian government news agency reported a number of missiles targeting military positions in Homs province, but the missiles had been "denied and diverted from its tracks".
Three civilians were wounded in the attack, according to the Syrian government news agency, without elaborating in detail.
3. The basement of the chemical weapon Him Shinshar, west of Homs
General Dunford said the basement, which is about seven kilometers from the chemical weapons storage location, "contains chemical weapons storage facilities and an important command post".
According to Lieutenant General Kenneth McKenzie as director of the US Joint Military Staff, seven SCALP missiles were deployed and "successful" about the dungeon.
He added that US, British and French attacks "are capable of making the Syrian air defense system overwhelmed".
"We are confident that all our missiles reach their targets.At the end of the attack mission, all the planes return safely to the base," he said.
The US military estimates more than ground-to-air missiles have been launched by Syrian government forces.
However, "the launches occurred after the completion of our attack," McKenzie said.
What does Russia say?
Russian military spokesman Colonel Sergei Rudskoi told reporters in Moscow that "a number of Syrian military airfields, industries and research facilities" were targeted by US, British and French missile attacks.
According to him, preliminary reports show that as many as 103 cruise missiles have been raided to Syria in the attack.
Syria's air defense system, mostly installed in the Soviet era, he said, "successfully counteract air and sea attacks". A total of 71 cruise missiles were successfully deflected, Rudskoi said.
Russian military data also shows:
- Four missiles targeting Damascus International Airport
- The 12 missiles target the Dumayr air base, east of Damascus. However, everything was shot down.
- 18 missiles target the air base Marj Ruhayil (Bulay) south of Damascus.
- The 12 missiles targeted Shayrat's air base, but all were shot down.
- Four of the nine missiles targeting the Mezzeh military air base were shot down.
- 13 of the 16 missiles targeting the "Homs Air Dome" were shot down.
- 30 missiles targeting facilities suspected to be linked to alleged Syrian chemical weapons programs in Barzeh and Jaramana in the southeast of Damascus.
A total of seven missiles were shot down. The facilities were partially destroyed, but have not been used for a long time, Rodskoi said.
"Russia considers it a response to the success of the Syrian armed forces in combating international terrorism and liberating its territory, rather than a response to the alleged chemical attack," Rudskoi said.