[Ads-l] "among the data"?

[Joel S. Berson]

Something in the following grates, but I'm not sure how to analyze or 
describe it:

" '...' said Swedish [CEO of Anthem], whose personal information was 
among the data accessed in the attack. "

An Associated Press item, AP writer Ricard Alonso-Zaldivar, on the 
NYTimes web site titled "Hackers Access Records for Millions of 
Anthem Customers."

"Among" requires a genuine plural, and doesn't work with a mass noun?

Joel

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