A man arrested over fires at three black churches in Louisiana is the son of a sheriff's deputy.

At least 22 people have died in Central America as Tropical Storm Nate dumped heavy rain across the region.

Two more people have been confirmed dead in Texas in the wake of Storm Harvey, bringing the number of known fatalities to 44, eight days after it made landfall as a hurricane.

The US Navy have rescued 14 people at an elementary school in Texas after floodwaters from Hurricane Harvey threatened to immerse their shelter.

A masked former US Marine murdered three Louisiana police officers in an apparent petrol station ambush, less than two weeks after a black man was shot dead in a confrontation that sparked nightly protests that reverberated throughout America.