(Reuters) -Health and life insurer Aflac topped Wall Street estimates for third-quarter profit and revenue on Tuesday, driven by investment gains and higher premium growth in its United States division.

Shares of the company were up more than 2% in extended trading.

The Columbus-based insurer provides accident and pet insurance plans through its units in the United States and Japan. Additionally it offers supplemental insurance to help cover out-of-pocket costs, including specialized coverage for critical illnesses, dental care and ophthalmological requirements.

The company’s U.S. unit earned net premiums of $1.5 billion in the third quarter, up 2.5% from a year earlier. Sales in the U.S. increased 2.8% during the quarter, driven by strong demand for group life and disability products.

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