Under mounting criticism from Congress and federal regulators, the eight biggest U.S. movie studios adopted 12 voluntary initiatives meant to limit the amount of violence children see.

The companies, including

Walt Disney

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,

News Corp.'s

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Twentieth Century Fox and

Viacom's

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Paramount Pictures

, said they would review marketing and advertising practices and appoint a senior executive as compliance officer or create a committee to review practices.

The companies also will ask theater owners to stop showing previews for movies that contain violent scenes during films aimed at children and will link official movie Web sites to specific sites that describe the movie rating system.

The moves comes after the

Federal Trade Commission

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released a report this month that said R-rated movies -- which require a parent or guardian to accompany anyone under 17 -- were sometimes targeted at children as young as 10. The report prompted criticism from federal lawmakers and an invitation to the studio executives to explain their actions at a committee hearing tomorrow.

Other companies that committed to the voluntary initiatives include

Metro-Goldwyn-Mayer

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,

Sony

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,

Seagram's

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Universal Studios

and

Time Warner's

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Warner Bros.