The phrase "among those believed" is correct and usable in written English.
It can be used when referring to a group of people or things that are thought to be a certain way or to have a particular quality.
Example: "Among those believed to have witnessed the event, several provided conflicting accounts."
Alternatives: "among those thought" or "among those considered".
Among those believed arrested is the murdered woman's daughter, Sylvia, and her businessman son-in-law.
The four embassy staff expelled yesterday are said to be among those believed to be spies.
Both teams were among those believed to be pursuing Brown at the N.H.L. trading deadline.
Among those believed held was Lazar Charité, once a leader of Tunisia's fight for independence from French rule.
Among those believed killed in the crash of the Dulles-to-Los Angeles flight were members of a National Geographic Society educational trip, society officials said.
Among those believed to have been arrested during the clashes was Bothaina Kamel, the country's only female presidential candidate and an outspoken opponent of military rule.
Among those believing that Obama will win were most independents and almost a fifth of Republicans.
Among those believing James is headed out of the Rust Belt is ESPN.com's Chris Sheridan, while the Cavaliers are left to pick up the pieces.
Among those believing in the truism that nostalgia is a powerful sales tool during tough times are Brut, Cotton Inc., General Mills, McDonald's and Pepsi-Cola.
We found that, even after controlling a host of factors — including ideology and attitudes toward African-Americans — Tea Party identifiers were more common among those believing that Obama actively promotes socialism.
So compelling was Ms. Swenson's creation that powerful online connections were made among those who believed in the Kaycee persona and among those who pulled it apart.
