Federal investigators say they have no indication that the shooting was an act of terrorism.
"Any time bombs are used to target civilians, it is an act of terrorism, " Obama said.
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And he reiterated that Yemeni investigators believe that the attack was an orchestrated act of terrorism.
The Turkish government has been reluctant to call Monday's explosion an act of terrorism.
He acted alone, Shavack said, and the shooting was not an act of terrorism.
For example, the FBI declared immediately after the attack that it was not an act of terrorism.
"Pakistan is determined to ensure that its territory is not used for any act of terrorism, " he said.
Jose Sarney, president of the Senate and a former President of the Brazil, called it an act of terrorism.
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President Obama said that what happened in Boston was an act of terrorism.
His first suspicion, not surprisingly in modern-day London, is that he's seen an act of terrorism in his city.
And given what we now know about what took place, the FBI is investigating it as an act of terrorism.
Initially, officials weren't told whether the incident was an act of terrorism.
However, top lawmakers declared the deadly incident an act of terrorism, and a White House official said it was being treated that way.
While police were still working the crime scene in London, British Prime Minister David Cameron said the attack was probably an act of terrorism.
But federal authorities are classifying it as an act of terrorism.
Law Minister Khalid Ranjha told the BBC that the crime was being considered "an act of terrorism" and those responsible would be tried before an anti-terrorist court.
"Based on what we know so far, I do consider it an act of terrorism, " Winuk said Wednesday, before news broke of a possible suspect in the case.
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.
The Angolan government called the incident an "act of terrorism".
U.S. Rep. Bennie Thompson, D-Mississippi, who chairs the House Committee on Homeland Security, said the attempted act of terrorism would be the focus of an oversight hearing next month.
CNN: Source: Terror suspect's father tried to warn authorities
Pakistan's Foreign Office said the government "condemns this heinous act of terrorism in the strongest possible terms and hopes that the perpetrators of this barbaric act will be brought to justice".
Everyone everywhere condemns without reservation the act of terrorism.
" He called the attack "an act of terrorism.
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The carrier said in a statement that it saw "no evidence" that the technical outage was in any way related to Monday's deadly bombing in Boston that is under investigation as an act of terrorism.
"It's an atrocious act of terrorism, against which the Italian government expresses its firmest condemnation, and which has no explanation, if not that of barbarous and blind violence, " a statement from Italy's foreign ministry read.
Holder also declared the attack at the Sikh gurdwara, or house of worship, in a Milwaukee suburb to be "an act of terrorism, an act of hatred, a hate crime "that is anathema to the founding principles of our nation and to who we are as an American people.
CNN: At service, Holder calls Sikh temple shooting a hate crime
On Twitter, most of the comments appeared to be negative, with some dismissing his suicide as an act of "terrorism" or labelling him a "Nazi".
But the urgency of the threat, and the catastrophic consequences of even a single act of nuclear terrorism, demand an effort that is at once bold and pragmatic.
WHITEHOUSE: Nuclear Security Summit: Presidential Press Conference
An indictment against Mr Abassi, unsealed on Thursday, alleged he came from Canada and was fraudulently seeking a US work visa in order to "facilitate an act of international terrorism".
We cannot wait for an act of nuclear terrorism before coming together to share best practices and raise security standards, and we will seek firm commitments from our partners to do just that.
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