White House aides had discussed whether the president should label the attack as terrorism.
Politics aside, experts point out that classifying an attack as terrorism carries important legal and investigative meaning.
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Mr. RANSTORP: Well, I think that the assessment by the British anti-terrorism branch before the attack was that it would be some homegrown element's at least part of the operation.
However no explosives were recovered by Belgian police, and some terrorism analysts are skeptical that an attack was imminent.
You've got to be able to protect your citizens and their right to freedom from attack: freedom from terrorism.
After the latest attack, Mr Bouteflika insisted terrorism was in retreat "despite the distressing and hurtful consequences of these operations that have targeted the Algerian people".
The European Convention specifically recognizes that you have got to be able to protect your citizens and their right to be free from attack, or free from terrorism.
" He called the attack "an act of terrorism.
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And he reiterated that Yemeni investigators believe that the attack was an orchestrated act of terrorism.
Anyone with any information about the attack should contact the Anti-Terrorism Branch on 0800 789321.
While police were still working the crime scene in London, British Prime Minister David Cameron said the attack was probably an act of terrorism.
Mohammad Aslam Khan, head of Karachi counter-terrorism cell, told the BBC that the attack was "clearly targeted" at the Bohra Ismaili Shia community, from which most of the dead and injured came.
"We have all had to become ambassadors for our religion, we have had to condemn every terrorist attack or be labeled a supporter of terrorism, " she said.
For example, the FBI declared immediately after the attack that it was not an act of terrorism.
While the clues moved the investigation forward, it is still unclear whether the attack was an act of domestic or foreign terrorism.
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India's top anti-terrorism investigators are visiting the site of Saturday's deadly attack by Maoist rebels in the state of Chhattisgarh.
In Belgrade, the Yugoslav parliament cut short its session in protest at the terrorist attack, which it described as an act of terrorism aimed at destabilising the area.
While at the FBI, Soufan was involved with investigations of sensitive international terrorism cases, including the East Africa bombings, the 2000 attack on the USS Cole and the September 11 attacks.
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Investigators were trying to determine whether he is mentally ill, and if the motive for the alleged attack might fall under the legal definitions of domestic terrorism, a hate crime or something else, law-enforcement officials said.
Ciampi said the attack would not change Italy's resolve to fight terrorism.
"In October, about a third said they were worried that a family member would become a victim of terrorism, and that number is unchanged in the wake of the attempted attack in December, " Holland said.
And Mr Portillo then went on to support the decisions and to deliver an attack on those Labour backbenchers he claimed were less than committed to the action against terrorism.
Authorities arrested three men this week in Georgia's breakaway republic of Abkhazia on charges of plotting the attack in a joint operation with Abkhazian security services, the Russian National Anti-Terrorism Committee said, according to the state-run RIA Novosti news agency.
Counter-terrorism officers say muscular powers of arrest enable them to disrupt terrorists' networks and their plans to attack, even when there is insufficient evidence to convict them.
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