Investigators say they can confirm only one overlapping visit to Las Vegas, on Aug. 13 and 14, although they say the picture may not be complete.
Foreign officials in Kabul could not confirm the number of Americans who had been killed, and on Monday the State Department confirmed only one American death.
The authorities confirmed only one of the killings.
The authorities in Zimbabwe confirmed only one of the killings.
Medics in Mariupol talking to the Guardian, however, could confirm only one death and 15 injures.
At the Treasury Department, for example, the Senate has confirmed only one appointee, but Secretary Timothy Geithner is hardly alone.
The police in the Bronx this week have confirmed only one cat fatality, according to a department spokeswoman.
Russia's emergencies ministry had said that two Britons were among the eight foreign citizens who died in the attack, but the UK foreign office said it could confirm only one death.
In a separate blog post, Twitter said that it's investigation has confirmed "only one set of technical circumstances where this issue could have occurred".
