U.S. President Barack Obama declared on Friday a state of emergency for New York state as Hurricane Irene is approaching the U.S. East Coast, threatening to wreak massive havoc on its path.

Public School 187 is seen as it is turned into a shelter for the upcoming Hurricane Irene, in Brooklyn, New York, the United States, Aug. 26, 2011. Shelters like this will provide people with supplies and a safe place to rest during the upcoming hurricane. New York City Mayor Michael Bloomberg announced Friday that mandatory evacuations have been ordered for residents living in the low-lying areas of the city. [Fan Xia/Xinhua]

The declaration mandates the coordination of disaster relief efforts among federal agencies, including the Homeland Security Department and the Federal Emergency Management Agency, which will provide federal emergency aid to the New York state.

The federal agencies will specifically help the counties of Bronx, Kings, New York, Queens, Richmond, Nassau and Suffolk to carry out future relief efforts in the wake of the hurricane.

Irene, estimated to threaten over 65 million residents living along the East Coast, is expected to hit the New York City and Long Island on Sunday. Authorities have warned that the "historic" hurricane could bring massive flooding, power outages and property damages on its path.

Hurricane Irene track forecast (Data as of 5 p.m. PDT Friday) [maps.google.com]

Earlier Friday, the New York City issued a hurricane warning, the first since 1985, ordering about 300,000 residents along the coastal area to evacuate ahead of Irene's arrival.

Hurricane warnings have been issued along a stretch of the East Coast from North Carolina in the south to New England to the north. State of emergency have already been declared in seven states, including North Carolina, Maryland, Virginia and New Jersey, with several coastal cities ordered to be evacuated.

As of Friday afternoon, Irene was causing heavy rain, high wind and rough seas along the coast of North Carolina.

Obama cut short his vacation in Martha's Vineyard off the coast of Massachusetts on Friday to return to Washington a day ahead of schedule, to deal with the emergency situation related to Hurricane Irene.

The White House made the announcement shortly after Obama issued a statement from his vacation site, calling on residents on the East Coast living in the projected path of Hurricane Irene to take it "seriously," and get prepared in advance of the "historic" storm.

Obama convened a conference call Friday morning and was briefed by Napolitano, Fugate, White House Chief of Staff Bill Daley and other senior administration officials about the preparations for Hurricane Irene.