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(Reuters) – Facebook Inc and banks including Morgan Stanley were sued by the social networking leader’s shareholders, who claimed the defendants hid Facebook’s weakened growth forecasts ahead of its $16 billion initial public offering.

The defendants, who also include Facebook Chief Executive Officer Mark Zuckerberg, were accused of concealing from investors during the IPO marketing process “a severe and pronounced reduction” in revenue growth forecasts, resulting from increased use of its app or website through mobile devices. Facebook went public last week.

The lawsuit was filed in U.S. District Court in Manhattan on Wednesday, according to a law firm for the plaintiffs. A day earlier, a similar lawsuit by a different investor was filed in a California state court, according to a law firm involved in that case.

In the New York case, shareholders said research analysts at several underwriters had lowered their business forecasts for Facebook during the IPO process, but that these changes were “selectively disclosed by defendants to certain preferred investors” rather than to the public generally.

“The value of Facebook common stock has declined substantially and plaintiffs and the class have sustained damages as a result,” the complaint said.

Representatives of Facebook and Morgan Stanley did not immediately respond to requests for comment.

Facebook shares fell 18.4 percent from their $38 IPO price in the first three days of trading, reducing the value of stock sold in the IPO by more than $2.9 billion.

(Reporting by Dan Levine in San Francisco and Jonathan Stempel in New York; Editing by Gerald E. McCormick and Lisa Von Ahn)