Scotland's First Minister Alex Salmond described the incident as a "cowardly attack on innocent people".
Dutch Prime Minister Mark Rutte said the attack on Mr Wiels was a "cowardly deed".
What they have done may be unique, heroic, cowardly or ghastly, but they capture our imaginations.
"It's a mother's worst nightmare, and especially in the most cowardly way, " she said.
To the Minotaur, humanity consisted of loud noises and a series of cowardly and craven acts.
Second, it shows a willingness by Facebook to engage in cowardly behavior in battle.
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Cowardly over structural reforms, the negotiators were debonair when it came to cutting taxes.
Police said the attacks were "cowardly" and that one of the pensioners had required hospital treatment.
My prayers are with all the survivors and families of those lost in this cowardly act of violence.
With him are a studious but sultry librarian (Rachel Weisz) and her dim but cowardly brother (John Hannah).
She said her husband took the "cowardly" path for not speaking at his trial or apologizing for his crimes.
We call on those responsible to stop these cowardly acts immediately in order to allow the situation to deescalate.
That we were, at root, self-interested, cowardly, envious and potentially dangerous in groups.
His repeated refusal to take responsibility came across as deeply cowardly and un-leader-like.
He said he condemned the "cowardly threats and intimidation" against members of the District Policing Partnerships by dissident republicans.
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"These officers were extremely fortunate not to have been killed or injured by such a cowardly and callous attack, " she said.
General secretary Simon Block said Mr Oyebola was "one of nature's gentlemen" and the shooting was a "cowardly and gutless attack".
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Now his classmates assume that Randy White is more cowardly than ever.
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And believe me, board service is not for the weak or cowardly.
"The public revulsion and condemnation of this cowardly attack shows that the people of Pakistan will not be beaten by terrorists, " he said.
Two men have been found guilty of the "evil and cowardly" murder of a man who was stabbed to death in West Yorkshire.
As for its rhetoric, as the EU's rush to threaten Israel for allegedly killing a terrorist shows, it is cowardly, ineffectual and self-defeating.
"We hear threats all the time, but rarely so specifically, and that someone has already carried out in the most cowardly way, " he said.
"Their cowardly actions, carried out under the cover of darkness, are in stark contrast to the bravery demonstrated on the battlefields by our war heroes, " he said.
Addressing reporters in Geneva, Rupert Colville urged it and other extremist groups to stop "cowardly attacks" against civilians, security forces, Nigerian officials and foreign nationals.
James has been called narcissistic, cowardly, heartless and a deserter (and that was just by his former boss Dan Gilbert in his infamous letter).
In a televised statement, he condemned what he called a "cowardly" attack and said the security forces would "take full control" of the Sinai peninsula.
Syrian Information Minister Omran al-Zoubi called it a "cowardly, terrorist act".
Obama is trying to recast the image of terrorists from enemy warriors to cowardly thugs and move the United States away a state of perpetual war.
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