Burger King Worldwide Inc. is in talks to buy Canadian coffee-and-doughnut chain Tim Hortons Inc., a deal that would be structured as a so-called tax inversion and move the hamburger seller's base to Canada.

The two sides are working on a deal that would create a new company, they said in a statement, confirming a report on the talks by The Wall Street Journal. The takeover would create the third-largest quick-service restaurant provider in the world, they said.

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