Here are some details about attempted attacks around the world in the last 10 years, as Swedish police investigate bomb attacks in central Stockholm.
December 22, 2001 - Airports around the world went on high alert after British "shoe bomber" Richard Reid was caught trying to blow up an American Airlines plane from Paris to Miami with explosives hidden in his shoes. Reid, who said he was "at war" with the United States because it sponsored "rape and torture," was sentenced to life in prison in January 2003.
July 21, 2005 - Four men tried to set off bombs on three London underground trains and a bus but their devices failed to explode. The attempted copycat attacks came two weeks after suicide bomb blasts on the city's transport network killed 52 people in the first Islamist suicide bombings in western Europe.
July 2006 - Two bombs were planted on German trains soon after the country hosted soccer's World Cup, but they failed to explode. Two men were later convicted by a Lebanese and a German court.
June 29, 2007 - Police found and defused two car bombs packed with petrol, gas and nails near London's theater district. The first bomb was found in a green Mercedes parked outside one of London's biggest nightclubs, Tiger Tiger. The second was parked in a nearby street. June 30, 2007 - A jeep laden with petrol was rammed into a terminal building at Glasgow Airport. One of the men in it later died. No one in the building was injured.
May 22, 2008 - Muslim convert Nicky Reilly was wounded when a homemade bomb exploded as he tried to assemble it in the toilets of the Giraffe restaurant in Exeter in southwest England. He was arrested as he staggered outside with injuries to his face and hands. He was jailed for life in January 2009. December 25, 2009 - Nigerian Umar Farouk Abdulmutallab was seized after an alleged attempt to blow up U.S.-bound Northwest flight 253, with explosives sewn into the crotch of his underpants, as it approached Detroit. Passengers and crew extinguished the flames and restrained him.
-- A U.S. grand jury indicted Abdulmutallab on six charges including attempted murder and the attempted use of a "weapon of mass destruction" to bring down a plane.
May 1, 2010 - Faisal Shahzad tried to set off a car bomb in New York's Times Square. He was sentenced in October to life in prison after he defiantly said more attacks on America were imminent.
May 14, 2010 - Roshonara Choudhry, a female student, thought to have been converted to violence by a radical preacher in Yemen, tried to murder British Labour MP Stephen Timms in revenge for his having voted for the Iraq war. He was at his east London surgery holding a monthly meeting with constituents. She was jailed for life in November 2010.
November 5, 2010 - The Yemen-based al Qaeda in the Arabian Peninsula claimed responsibility for a foiled plot to send explosive parcels to the United States. Two parcel bombs were intercepted on cargo planes in Britain and Dubai.
December 11, 2010 - A car blew up in Sweden's capital, Stockholm in a busy shopping area, followed minutes later by a second blast nearby which killed one man, the suspected bomber, and injured two people. The blasts followed an emailed threat referring to Sweden's troops in Afghanistan and to cartoons of the Prophet Mohammad.
-- Chief Prosecutor Tomas Lindstrand said the man had probably been aiming for a big target, like the railway station or a large central department store. He said the man had been "98 percent identified," as Taymour Abdulwahab, who has been widely named in media reports. Lindstrand said Abdulwahab came from the Middle East, while reports said he came from Iraq.