The NYPD ramped up security at 10 subway stations yesterday after the MTA was forced to install a controversial ad campaign branding enemies of Israel "savages," sources told The Post.

The 46- by 30-inch ads — which the MTA unsuccessfully tried to block — were pasted into subway walls throughout the day in heavily trafficked areas such as Grand Central Station and Times Square.

The American Freedom Defense Initiative, a pro-Israel group spearheaded by activist Pamela Geller, paid $36,000 for 30 days of ad space.

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