As a new cyberattack hits companies and government agencies around the world, here is a look at some of those that have confirmed they are affected.
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Merck: second-largest drugmaker in the United States, based in Kenilworth, New Jersey
Mondelez International: U.S. food and drinks company based in East Hanover, New Jersey
DLA Piper: global law firm based in U.S. and U.K.
Heritage Valley Health System: hospital and health care system near Pittsburgh, Pennsylvania
WPP: advertising company based in London
Rosneft: Russia's largest oil company, partly state-owned
Ukraine: power grid, banks and government offices
TNT Express: Netherlands-based transport company
AP Moller-Maersk: oil and shipping company based in Copenhagen, Denmark