At least two people are dead and eight wounded after a gunman started shooting outside New York's iconic Empire State Building in midtown, Manhattan.
One of the dead was the shooter, the source said, adding that there was no apparent link to terrorism.
The victims were shot shortly after 9 a.m. (1300 GMT) on the sidewalk on Fifth Avenue outside the 102-story building in Midtown Manhattan.
The shooting broke out at the height of the tourist season outside one of New York City's most popular attractions, startling tourists and commuters in one of the busiest areas of the city.
The building is two blocks from Pennsylvania Station, one of New York City's main transportation hubs.
The United States has had two other mass shooting cases this summer. On July 20, James Holmes, aged 24, is accused of having opened fire at a midnight screening of the Batman film "The Dark Knight Rises" in Aurora, Colorado, killing 12 people and wounding 58.
On August 5, a gunman killed six people and critically wounded three at a Sikh temple outside Milwaukee before police shot him dead in an attack authorities treated as an act of domestic terrorism.
The Empire State Building was the world's tallest building for 40 years from its completion in 1931 until construction of the World Trade Center. Following the September 11, 2001, attacks, it was again the tallest building in the city.
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