Biden declares emergency as Florida braces for Tropical Storm Helene

Storm developing over Caribbean could become category 4 hurricane by Thursday as evacuations ordered in Florida

Joe Biden declared a state of emergency for Florida on Tuesday afternoon as the state braced for the prospect of Tropical Storm Helene swelling into a powerful hurricane heading for the state's Gulf coast.

The US president ordered federal assistance to supplement state and local responses. The action authorizes the Department of Homeland Security and Federal Emergency Management Agency (Fema) to coordinate all disaster relief efforts to alleviate hardship and suffering, the White House said.