Amazon is planning to open hundreds of physical bookstores, according to a large mall CEO who spoke to Dow Jones.

General Growth Properties CEO Sandeep Mathrani mentioned Amazon's bookstores in response to a question about mall traffic in an earnings call with analysts on Tuesday, according to a Wall Street Journal report.

"You've got Amazon opening brick-and-mortar bookstores and their goal is to open, as I understand, 300 to 400," Mathrani said.

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The Journal reported that it was not clear where Mathrani got the potential number of stores. The news agency added that the CEO may have discussed plans with real-estate executives.