More than 30,000 people have been evacuated from their homes in Houston after heavy rainfall from Storm Harvey caused extensive flooding.
No evacuation was ordered by the local government, leaving many trapped in dangerous areas and emergency services have been stretched.
The so-called Cajun Navy, run by volunteers, has stepped in with their own boats to help people affected.
The Louisiana group came together after Hurricane Katrina in 2005.
It’s co-ordinated rescue efforts ever since after natural disasters like hurricanes and tropical storms.
Cajun Navy organiser Clyde Cain told CNN: “Our goal is to help people get out if they are trapped in their homes or apartments, get them to safety.”
The group sent 20 boats on a 300-mile trip to Houston on the back of trucks.
Since Katrina in 2005, the group has grown and co-ordinates rescue efforts through its Facebook page.
It helps people prepare for storms, with food distribution, and helps in rescue operations.
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