President Barack Obama's warning about Syria's unconventional weapons arsenal is one of those "sit up and take notice" moments.
Hours before Netanyahu's warning, Israel's new Defense Minister Moshe Yaalon also said that he will not allow rocket attacks to become routine again.
The head of the UN's agency for Palestinian refugees, the United Nations Relief and Works Agency, echoed Ms Mercado's warning, saying Syria's conflict was on the verge of overwhelming the UN.
It's that suddenly, he's driving a vehicle that doesn't handle very well and there's no warning that it's going to get away from him.
So Microsoft is ratcheting up the pressure on Yahoo's board, warning if there's no agreement within three weeks, Microsoft will go directly to Yahoo's shareholders in an effort to gain control of that company.
But given that the Surgeon General's warning on smoking came in 1964, it's doubtful that many people needed a reminder of cigarettes' health risks 34 years later.
President Obama even made a light-hearted reference to Mr Netanyahu's warning of a "red line" with Iran's nuclear programme.
The U.S. operation that killed bin Laden severely strained ties with Pakistan as the U.S. sent in Navy SEALs from Afghanistan without warning Pakistan's government or military.
Earlier this month, U.S. Assistant Attorney General Thomas Perez wrote a letter warning Alabama's education department that the law has had "lasting" and possibly illegal consequences for Hispanic school children.
It is too early to tell whether the Chinese aviation authority's warning of cutbacks, delivery deferrals and even cancellations will seriously hurt Europe's flagship plane-maker Airbus.
The dollar fell in Tokyo on Wednesday following the warning, sliding against both the yen and the euro in Asian trade, despite reminders that the Fund's warning was not new.
All of which makes Mr Lee's strident warning, as the head of South Korea's most successful company, more puzzling.
Still, when we take advantage of them, we ought always to heed Woolf's warning, never to write carelessly.
That means maximum engine power, hence Michael Schumacher's warning that BMW Williams will be a force.
However, some say the Justice Department's warning left the public in the same state.
Never mind the Surgeon General's warning on both types of cigarettes that they can be killers.
That is where Monday's warning of unrest by the Public and Commercial Services Union comes in.
U.S. Secretary of State Hillary Clinton also addressed the defense minister's warning of a collapse.
Mr Tenet's warning may sound like someone defending a status quo that did not work.
ECONOMIST: Intelligence reform: Centralised intelligence? | The
Madonna's spokeswoman Liz Rosenberg said the singer was aware of the threat and the embassy's warning.
Mr Miliband's comments follow former Prime Minister Tony Blair's warning to avoid promising ever more public spending.
Today's warning letters are another demonstration of our commitment to remove illegal, unproved drugs from the market.
Witherspoon's husband mostly observes the exchange, but tries to calm her after the trooper's warning about resisting arrest.
Gen Dunford's warning was made public after the New York Times obtained a copy of his mail.
BBC: Karzai speech 'put Nato forces at risk', commander warns
But he rejected the RCN's warning that a regional approach to pay, terms and conditions would harm patient care.
America Online 's warning this morning is neither a surprise, nor a disaster.
If Yahoo's warning of a softening online ad market holds true for everyone, Google will be chasing after diminishing returns.
When even an old regulatory chum says that he cannot see any problems looming, Buttonwood's warning bells start to ring.
In this case, presidential hopeful Abdullah Gul responded to the army's warning by saying he would not withdraw his candidacy.
EMC's warning was mildly worded, but its implications were clear enough to investors: The stock fell 6.1% in heavy trading.
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