Sixty-seven Britons died in the attacks, the biggest loss of British life in a terrorist attack.
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Bulgaria's foreign minister, Nikolay Mladenov, told CNN he presumes the explosion was a terrorist attack.
Back in the United States, the threat of a terrorist attack has reached a disturbing level.
Mr. DEVALPINE: You know, obviously the chances of a terrorist attack here are unlikely and remote.
Police treated such incidents as a possible prelude to a terrorist attack, he added.
But the reality is without it, we would not have gone 12 years without a terrorist attack.
Britain's Prime Minister David Cameron says there are strong indications there was a terrorist attack in London today.
Bulgarian Interior Minister Tsvetan Tsvetanov said he was not excluding the possibility that the explosion was a terrorist attack.
The landmark also had been shut down during millennium celebrations in December 1999 amid fears of a terrorist attack.
Nuclear power plants must have fences and defenses to thwart a terrorist attack.
They juggled the job with the demands of motherhood, eldercare and other personal issues that don't disappear after a terrorist attack.
In a cybersecurity emergency, such as a terrorist attack or a major natural disaster, our country must be prepared to respond without delay.
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One, we condemn in the strongest terms a terrorist attack on BP personnel and facilities in Algeria, and we are closely monitoring the situation.
In addition to declaring the blast a terrorist attack, the State Department said the incident illustrates the need for congressional funding for improvements in diplomatic security.
When a rail bridge in southern Uzbekistan mysteriously exploded last autumn, depriving southern Tajikistan of its rail connections, few believed Uzbek claims of a terrorist attack.
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The Rock - which sees Connery play an Alcatraz escapee trying to thwart a terrorist attack on San Francisco - had Channel 5's third highest-ever audience.
The lease reportedly contained a provision letting Silverstein off the hook for rent in the event of a terrorist attack, with control reverting to the Port Authority.
Speaking in Paris, Britain's prime minister, David Cameron, said his government is urgently seeking the full facts, but there are strong indications this was a terrorist attack.
There is opposition from those who insist this is a private-sector matter, but insurers retort that they would still incur big losses in the event of a terrorist attack.
Ronald Dick, director of the FBI's National Infrastructure Committee, told a House subcommittee hearing that the nation's water supply may seem to be a logical target for a terrorist attack.
The odds of dying from a terrorist attack are much lower than the odds of dying from doing any of a number of incredibly mundane things we do every day.
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Peter Donovan, an oil-options broker at Vantage Trading working on the floor of the New York Mercantile Exchange, said some traders quickly exited positions after the erroneous report of a terrorist attack.
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"The Kenyan government warned on 15 May of the dangers of a terrorist attack by an individual they believe to have been involved in earlier terrorist incidents in Kenya, " the statement said.
The third tower was occupied by the Secret Service, the CIA, the Department of Defense and the Office of Emergency Management, which would co-ordinate any response to a disaster or a terrorist attack.
During the past 15 years or so international bank regulation has been concerned mostly with the ability of the system to sustain shocks, such as a stockmarket crash, a foreign-exchange crisis or a terrorist attack.
In June, a Gallup poll showed that 19% of New Yorkers were very worried that they or a family member would become a victim of a terrorist attack in America, and another 34% were somewhat worried.
"In the wake of the recent attacks in Mumbai, India, concerns about terrorism here in the U.S. have grown a bit, but most Americans don't think a terrorist attack is likely in the next few weeks, " said Holland.
The US government had previous funded MIT to do research into how carbon nanotubes could be used to detect nerve toxins including Sarin following a terrorist attack on the Tokyo subway which killed 12 people in 1995.
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