U.S. markets ended Tuesday's session mixed as Google went shopping, AIG named a new CEO and Allergan spurned a sweetened takeover offer from Valeant. Tech giant Google announced it is buying Skybox Imaging for $500 million. Google will use Skybox's technology to improve Google maps. AIG says Peter Hancock will become the company's new President and CEO on September first. Hancock will replace Robert Benmosche as head of the insurance giant. Benmosche will stay involved in AIG in an advisory role. Allergan said thanks, but no thanks, to a sweetened $53 billion dollar takeover bid from Valeant. Activist investor Bill Ackman, who owns nearly 10 percent of Allergan, says the offer undervalues Allergan's growth prospects. Ruben Ramirez reports from Wall Street.

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