(CNN) There was confusion Tuesday whether a team of international experts had arrived in the Syrian city of Douma to determine whether chemical weapons were used in an attack there 10 days ago.

Syrian state TV and the White Helmets volunteer rescue group said separately that a fact-finding team from the Organization for the Prohibition of Chemical Weapons had come to Douma.

But a US State Department spokeswoman contradicted those reports on Tuesday afternoon. "Our understanding is that the team has not entered Douma," Heather Nauert said.

Adding to the confusion, Syria's ambassador to the United Nations told a UN Security Council meeting Tuesday that the OPCW team could travel to Douma on Wednesday if a UN security team there determines that it's safe to do so. Ambassador Bashar Jaafari said a UN security team had entered Douma Tuesday afternoon.

The OPCW would not comment to CNN on whether its experts were in Douma.