The action followed a week of threats of retaliation for a suspected chemical weapons attack on civilians in Douma, outside Damascus, where Syrian forces have always been battling rebels.
Russia's ambassador to the United States on Friday warned that there would be consequences for the USA -led military strikes on Syria, adding that it was not acceptable to insult Russia's president.
Volunteer first responders and activists said a chemical attack by the Syrian government killed more than 40 people in the town of Douma, which drew global outrage and prompted Washington and its allies to consider a military response. Pierce said she wanted "to state categorically. that Britain has no involvement and would never have any involvement in the use of a chemical weapon".
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The overnight strikes hit three sites - one in Damascus and two in Homs - which US President Donald Trump said were "associated with the chemical weapon capabilities of Syrian dictator Bashar al-Assad".
The suspected poison attack by the Syrian government forces that allegedly killed over 40 people, according to volunteer first responders and activists, has drawn worldwide outrage and prompted the USA and its allies to consider a military response.
The medics said none of the patients were hurt by chemicals.
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Syria and its ally Russia have denied such an attack took place, and Moscow has accused Britain of helping to stage the Douma incident to stoke anti-Russian hysteria.
The Russian Foreign Ministry also claimed that following Syrian rebels' withdrawal from the eastern Ghouta suburbs of Damascus, stockpiles of chemical agents were allegedly found there. Syria's civil war, which began as a popular uprising against Assad, is now in its eighth year.
A team of inspectors from the OPCW arrived in Syria on Thursday and Friday and had been expected to start their investigation into the alleged Douma attack on Saturday.
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Lavrov noted that Russian and US militaries have a hotline to prevent incidents, adding that it's not clear if it would be sufficient amid mounting tensions.