Hurricane Sandy: Obama declares state of emergency for nation's capital

President Barack Obama has declared a state of emergency in the nation's capital as Hurricane Sandy approaches.

The White House said in a news release that the president on Sunday signed the state of emergency declaration, which had been requested by Mayor Vincent Gray. It says federal aid should supplement the city's response efforts due to the emergency conditions.

Obama's action authorises the US Department of Homeland Security and the Federal Emergency Management Agency (FEMA) to coordinate disaster relief efforts, and to provide assistance for required emergency measures. The order clears the way for FEMA to mobilise and provide equipment and resources to help.

The move follows the federal government's decision to close offices on Monday. Washington's Metro system will also be shut down on Monday, as will most school systems.