Several said a unusual smell started spreading and people screamed: "It's chlorine!"
Russian state-run media outlet TASS said a team from its conflict monitoring center in Syria had examined Douma on April 9, two days after the alleged attack, and found no sign of chemical use.
"For we can not allow the use of chemical weapons to become normalized - either within Syria, on the streets of the United Kingdom or elsewhere", May said. He showed CBS News what he said was the origin of the deadly gas: a missile on the roof of the building.
Nauert added that she was aware of reports from Syria that inspectors from the Organization for the Prohibition of Chemical Weapons had been able to see the site but "our understanding is that the team has not entered Douma". It also reported a separate air strike on the Dumayr air base near Damascus.
The team was widely expected to visit Douma on Wednesday, but a United Nations security team carrying out reconnaissance in the city came under fire Tuesday, further delaying experts from going in, a UN source told CNN.
Western states have blamed the Syrian government forces for the incident, but Damascus has denied using chemical weapons. Britain denies the allegation.
As CBS News correspondent Seth Doane reports, rebel forces had held Douma nearly since the start of the war in Syria, now more than seven years old, and the government's fight to take it back was fierce.
The Russian military later said that it will help secure the visit of global chemical weapons inspectors to the site of the alleged attack.
Prices slip but on track for weekly gain
The OPEC's report didn't provide any record for Iran's oil output based on direct communication in the mentioned month. NYMEX crude for May delivery was down 21 cents, or 0.3%, at $66.86 a barrel early on Friday.
Cynthia Nixon Burns "The Bad Cuomo" on Colbert
A "dumbfounded" Senate Majority Leader John Flanagan (R-Suffolk County) blasted it as "illegal and horrific public policy". Barone said he was contacted by the governor's office shortly before the executive order was signed.
Weathercast: Severe storms on Wilson's radar for Sunday
Afternoon temperatures will be in the mid-50s with winds gusting to 20 miles per hour for a much cooler than normal mid-April day. Surface winds will be increasing Monday afternoon 15 to 25 miles per hour and gusting at times to 30 miles per hour .