The consultancy firm, previously part of Andersen Worldwide, confirmed that a total of 12 of its employees were still missing, but would not release any further details.
Initially there were rumours that a London-based team of 20 had been lost in the disaster, but a spokesperson for Accenture denied this was the case.
Earlier, AccountancyAge.com reported that the main New York office of Deloitte & Touche had been destroyed in the tragedy when the twin towers collapsed.
The office, at 2 World Financial Centre, would have been the base for a number of UK employees on secondment to the US firm.
Deloittes is carrying out a roll call of staff and has not reported any casualties.
So far none of the other Big Five firms have reported missing staff or casualties.
The second largest improvement in ‘significant’ levels of financial distress since the EU Referendum was in professional services, found research from Begbies Traynor
Just one half of UK practices have implemented a pricing structure around auto enrolment implementation and advice - with many suffering increased costs
Deloitte's north-west Europe foray; BDO, Smith & Williamson investment paths; Shelley Stock Hutter; and Wilkins Kennedy discussed by editor Kevin Reed on our Friday Afternoon Live broadcast
Accountants should alter their perspective on auto-enrolment to maximise business opportunities, according to Eric Clapton.