Fifteen elderly people were rescued from a nursing home in Texas after a photo of them sitting in floodwaters spread on social media.

The shocking scene came as Tropical Storm Harvey caused widespread flooding across the state, inundating homes and submerging highways.

David Popoff, an emergency management coordinator, confirmed 15 people were rescued from La Vita Bella, an assisted living facility in Dickinson, about 30 miles south of Houston.

"We were air-lifting grandmothers and grandfathers," Mr Popoff told The Galveston County Daily News, hours after the viral photo emerged showing at least eight people, and one cat, sitting in a room with muddy water up to their waists.

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The photo was shared by Timothy McIntosh, who told the paper that his mother-in-law, Trudy Lampson, owned the nursing home.

Mr McIntosh, whose photo led some to question its authenticity, later confirmed they had been rescued and thanked the rescuers.

"Thanks to all the true believers that re-tweeted and got the news organizations involved," he added. "It pushed La Vita Bella to #1 on the priority list."

Harvey came ashore late on Friday as the most powerful hurricane to hit Texas in more than 50 years and has killed at least two people.

The death toll is expected to rise as the storm triggers additional tidal surges and tornadoes, with parts of the region expected to see a year's worth of rainfall in the space of a week.

- The Telegraph