Nov 22 (Reuters) - Client data for JPMorgan Chase ( JPM )

, Citi, Morgan Stanley ( MS ) and other major banks

may have been accessed in a hack of a technology vendor, the New

York Times reported on Saturday, citing people familiar with the

matter.

SitusAMC said in a statement on its website on Saturday that

it had been the subject of a cyberattack on November 12,

compromising certain information from its systems and that "data

relating to some of our clients' customers may also have been

impacted."

The New York-based vendor for real estate lenders did not

identify any of its affected clients.

JPMorgan Chase ( JPM ), Citi and Morgan Stanley ( MS ) did not immediately

respond to Reuters requests for comment.

SitusAMC said the affected data included corporate

information tied to some clients' dealings with the

company, including items like accounting documents and legal

contracts.

"We remain focused on analyzing any potentially affected

data," Michael Franco, SitusAMC chief executive said in a

statement to the New York Times, adding that the company had

notified law enforcement.

FBI Director Kash Patel said in a statement, according to

the newspaper: "While we are working closely with affected

organizations and our partners to understand the extent of

potential impact, we have identified no operational impact to

banking services."

Reuters could not immediately reach the FBI for comment.

The SitusAMC statement said the incident had been contained

and services were fully operational, adding that no encrypting

malware was involved.