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Amtrak Police K-9 Unit police officer Jose Gonzalez (Credit: Photo by Mike Roy)

Amtrak Police K-9 Unit police officer Jose Gonzalez and his dog Lex, a yellow labrador trained to detect explosives, patrol streets and perimeter buildings near Penn Station. (Sept. 10, 2011)

Heightened security in NY, LI after terror alert

Security is stepped up in NYC and on LI after U.S. officials said they were chasing a credible but unconfirmed al-Qaida threat to use a car bomb on bridges or tunnels in New York or Washington. (Sept. 9, 2011)

Heavily-armed Suffolk County emergency service police officers at
(Credit: James Carbone)

Heavily-armed Suffolk County emergency service police officers at the Ronkonkoma train station, where security was tightened. (Sept. 9, 2011)

Heavily-armed Suffolk County emergency service police officers at
(Credit: James Carbone)

Heavily-armed Suffolk County emergency service police officers at the Ronkonkoma train station, where security was tightened. (Sept. 9, 2011)

MTA police K-9 keep a watchful eye on
(Credit: Photo by Howard Schnapp)

MTA police K-9 keep a watchful eye on the Mineola LIRR station as there is a heightened terror alert in Mineola, New York. (Sept. 10, 2011)

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Amtrak Police K-9 Unit police officer Jose Gonzalez
(Credit: Photo by Mike Roy)

Amtrak Police K-9 Unit police officer Jose Gonzalez and his dog Lex, a yellow labrador trained to detect explosives, patrol streets and perimeter buildings near Penn Station. (Sept. 10, 2011)

Heavily-armed Suffolk County emergency service police officers at
(Credit: James Carbone)

Heavily-armed Suffolk County emergency service police officers at the Ronkonkoma train station, where security was tightened. (Sept. 9, 2011)

An engineer from Local 94 welds a manhole
(Credit: Getty Images)

An engineer from Local 94 welds a manhole shut outside of Two World Trade Center in preparation for the 10th anniversary of the September 11, 2001 terrorist attacks on September 9, 2011 in New York City.

Police keep watch at a check point near
(Credit: Getty Images)

Police keep watch at a check point near the World Trade Center site on September 9, 2011 in New York City.

Police search vehicles near the World Trade Center
(Credit: Getty Images)

Police search vehicles near the World Trade Center site on September 9, 2011 in New York City.

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Port Authority police officers keep on eye on
(Credit: Craig Ruttle)

Port Authority police officers keep on eye on the PATH station at Ground Zero as they and other police agencies react to a possible terror threat. (Sept. 9, 2011)

MTA K-9 unit check the Hicksville LIRR station
(Credit: Howard Schnapp)

MTA K-9 unit check the Hicksville LIRR station after a heightened terror alert on Friday, September 9, 2011.

MTA police use dogs to check the Hicksville
(Credit: Howard Schnapp)

MTA police use dogs to check the Hicksville LIRR station on Friday, September 9, 2011.

MTA police use dogs to check the Hicksville
(Credit: Howard Schnapp)

MTA police use dogs to check the Hicksville LIRR station on Friday, September 9, 2011.

An MTA K-9 unit checks the Hicksville LIRR
(Credit: Howard Schnapp)

An MTA K-9 unit checks the Hicksville LIRR station during the heightened terror alert in New York. (Sept. 9, 2011)

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NYPD officers stop and look into a vehicle
(Credit: Craig Ruttle)

NYPD officers stop and look into a vehicle on Trinity Place just south of the Ground Zero area as NYPD and other police agencies act on a possible terror threat. (September 9, 2011)

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