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Tue 3 May 2011 01:15 PM

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US steps up security after Osama's death

Death of the mastermind of the 9/11 terror attacks could incite extremist groups, security experts fear

US steps up security after Osama's death
Members of the Metropolitan Transit Authority (MTA) Emergency Service Unit stand guard at Grand Central Station a day after the death of Osama Bin Laden on May 2, 2011 in New York City. President Barack Obama announced the death of Osama bin Laden during a late night address to the nation from the White House in Washington on May 1 (Getty Images)
US steps up security after Osama's death
Los Angeles Airport Police patrol the Tom Bradley terminal at Los Angeles International Aiport on May 2, 2011 in Los Angeles, California. Security presence has been escalated at airports, train stations and public places after the killing of Osama Bin Laden by the United States in Abbottabad, Pakistan (Getty Images)
US steps up security after Osama's death
Transportation Security Administration (TSA) agents screen passangers at Los Angeles International Airport on May 2, 2011 in Los Angeles. Osama Bin Laden was killed in an American military operation at a compound in Pakistan (Getty Images)
US steps up security after Osama's death
Los Angeles Airport Police patrol the Tom Bradley terminal at Los Angeles International Aiport on May 2, 2011 in Los Angeles, California (Getty Images)
US steps up security after Osama's death
Los Angeles Airport Police patrol the Tom Bradley terminal at Los Angeles International Aiport on May 2, 2011 in Los Angeles, California. World leaders have warned of revenge attacks after Osama bin Laden was killed in a US assault in Pakistan on Monday that brought to a dramatic end the long manhunt for the al Qaeda leader who had become the most powerful symbol of Islamist militancy (Getty Images)
US steps up security after Osama's death
Transportation Security Administration (TSA) agents screen passengers at Los Angeles International Airport on May 2, 2011 in Los Angeles. President Barack Obama declared the world was a safer and "better place" with bin Laden dead (Getty Images)
US steps up security after Osama's death
Transportation Security Administration (TSA) agents screen passengers at Los Angeles International Airport on May 2, 2011 in Los Angeles, California (Getty Images)
US steps up security after Osama's death
New York City Police officers and a K9 stand in a subway station May 2, 2011 in the Brooklyn borough of New York City. Security presence has been escalated as a precaution after US President Barack Obama announced that the US had killed the most-wanted terrorist Osama Bin Laden in an operation led by US Special Forces at a compound in Abbottabad, Pakistan (Getty Images)
US steps up security after Osama's death
Los Angeles Police Department officers patrol the Los Angeles International Aiport on May 2, 2011 in Los Angeles, California. Security presence has been escalated at airports, train stations and public places after the killing of Osama Bin Laden by the United States in Abbottabad, Pakistan (Getty Images)
US steps up security after Osama's death
Los Angeles Airport Police patrol the Tom Bradley terminal at Los Angeles International Aiport on May 2, 2011 in Los Angeles, California (Getty Images)