NEW YORK PROBES 'GAS LIKE ODOUR'
Authorities in New York are investigating a persistent gas smell across a large part of lower Manhattan.
Police said they were dealing with many reports of a strange gas-like smell, but Mayor Michael Bloomberg said he was confident it was "not dangerous".
A stretch of the commuter train service between New York and New Jersey was temporarily halted, and some Manhattan office buildings were evacuated.
The US Department of Homeland Security ruled out any link to terrorism.
Mr Bloomberg said there were no indications of high levels of natural gas on New York's energy network.
"It may just be an unpleasant smell, but at this point we do not know any more than that," he told a news conference, adding that investigations were continuing.
"The one thing we are confident about is, it is not dangerous," he said.
And the BBC's Jeremy Cooke, in New York, says the city is returning to normal.
Across the Hudson River in New Jersey, officials said the source of the smell was a gas leak originating in the Chelsea district of Manhattan, but that could not immediately be confirmed.
"We are getting several calls of a foul odour. Our units are responding. It's in various parts of the city," a police spokesman said. .......
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