Attorneys general from several states have issued demands for documents from Anheuser-Busch Cos. and Miller Brewing Co. as part of investigations into their marketing of caffeinated alcoholic drinks, the companies said.

The probes by attorneys general in New York, Maine and elsewhere focus on whether the companies’ marketing and sales efforts target underage drinkers. The companies haven’t been charged with any wrongdoing.

Drinks that combine alcohol with caffeine have become increasingly popular with young drinkers, including those under the legal drinking age. State attorneys general claim that beverage makers are irresponsibly taking advantage of this popularity by selling the drinks with misleading claims that they help users stay up late for partying.

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