The blocked resolution was drafted by the United States to continue an international investigation, which expired midnight Thursday, on who is to blame for sarin attacks in Syria.
A report by the UN Commission of Inquiry said the US failed to protect civilians in an airstrike hitting a mosque near Aleppo in March. It also says the Syrian regime was behind more than two dozen chemical weapons attacks in the country.
Families in the town of Khan Shaykhun try to carry on after the deadly chemical weapon attack on April 4 killed dozens and injured hundreds.
White House spokesperson Sean Spicer says "Assad and his military will pay a heavy price," if the Syrian regime conducts another mass murder attack using chemical weapons.
Regime Foreign Minister Walid al Moualem denied accusations that Syria used chemical weapons. He blamed Daesh and the opposition, saying they have been storing banned toxic agents.
In Idlib, survivors of a chemical attack describe scenes of "a tragic disaster."
Turkey and the World Health Organisation say victims from a suspected toxic gas attack died of chemical poisoning and were exposed to substances found in chemical weapons.
UN says four patients showing severe signs associated with exposure to a blister agent. The UN Humanitarian Coordinator in Iraq has called for an investigation.
In its latest report, the Human Rights Watch is calling for the UN Security Council to impose sanctions on the Syrian regime after claiming it used chemical weapons to retake eastern Aleppo.
Regime leader Bashar al-Assad is among 15 people named in connection to a number of chemical weapons attacks between 2014 and 2015. It is the first time any such investigation has implicated him directly.
The action marked the first time the United States has sanctioned Syrian forces officials for the regime's use of chemical weapons, according to a Treasury Department statement.
Amnesty International says up to 250 people may have died in likely blister agent attacks.
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