Britain also updated its travel warning, though it did not raise its alert level.
There's no increased alert level for airports, and the general alert level remains at yellow.
Mexico raised the alert level for the Popocatepetl volcano near Mexico City after observing increased explosive activity.
The World Health Organization on Monday raised its alert level from three to four on its six-level scale.
The World Health Organization on Monday raised its pandemic alert level in response to the outbreak of swine flu that originated in Mexico.
As we've been reporting, in the wake of today's bombings in London, US officials have raised the terror alert level for mass transit systems.
The French government was considering raising its alert level for airports.
WSJ: Nations Brace for Retaliation After Osama Bin Laden's Death
The separate five-stage combat alert level, known as "Defcon, " has not changed and remains at stage 4, South Korean defense spokesman Won Tae-jae said at Thursday's briefing, according to Yonhap.
CNN: South Korean, U.S. forces raise surveillance alert level
Outgoing Homeland Security Undersecretary Asa Hutchinson said federal authorities were not ready "to shake up America on this" by raising the nation's terror alert level above its current status of yellow, or elevated.
Federal officials lowered the nation's health alert level Monday from red, or "high, " to orange, or "elevated, " and said university and secondary students can return to class Thursday while younger students will wait until May 11.
But I should mention that some states and localities say they do not perceive any great risk to them, and they do not plan any additional security steps despite the step-up in the threat alert level.
CNN: Jeanne Meserve: Cities respond differently to terror alert
An "internal major incident" is the highest alert level the hospital has, and is only declared when a trust is concerned it can no longer guarantee beds for patients because of a higher-than-usual demand for its services.
BBC: Peterborough City Hospital in second bed shortage alert
The interior ministry said Saturday it had lifted the scarlet state of alert, the country's highest security alert level, which was put in place in the Toulouse region following the third shooting on Monday targeting a school.
Yonhap also reported that the South's National Police Agency had raised its state of alert by one level from "attention" to "caution".
Business, government and the public must constantly be alert to the level of risk if they are to succeed in detecting and resisting the threat of cyber attack.
The UN in Darfur has moved to its highest level of alert before full evacuation.
Now, with border officials at the highest level of alert, nearly every vehicle gets looked over.
Now, since border officials went to the highest level of alert, nearly every vehicle gets looked over.
U.S. military installations in the Central Command region overseas moved overnight to Condition Delta, the highest level of alert, U.S. military sources said Wednesday.
The appearance of the exploit on websites has led security firms to raise the level of alert, with Secunia describing the hole as extremely critical.
Large wildfires are burning on more than 600, 000 acres in 14 Southern, Western, and Midwestern states, and that's prompted officials to move to their highest level of alert.
To an extraordinary extent -- and with good reason -- the city considers itself on permanent alert, with a high level of vigilance that is our best protection.
The WHO raised the alert to the second highest level of five on Wednesday after a Mexican child died while on a visit to the US state of Texas - the first death from the swine flu outside Mexico.
The nation's civilian "high" alert -- the second highest level of warning -- was put in place Tuesday.
The Met Office has issued its first country-wide Level 3 cold weather alert of the winter, its second most serious warning.
It also allows them to specify the maximum price they are willing to pay so that users receive an alert when prices drop to a certain level.
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New York has been on "orange" alert, or the second-highest level -- indicating a high risk of terror attack -- since the color-coded warning system was established after the September 11, 2001 attacks.
The government raised the security alert in railway stations and airports to red, the second-highest level.
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In the past month, the average ratio of trading in bearish options relative to bullish options has risen to its highest level since October 2011, according to options-data firm Trade Alert.
Since this elaborate electronic hoax is an embarrassment to the university at a level, will athletic departments create red flag words and phrases that alert the school of illicit conversations and then monitor player electronic communications like cell phone and computer data?
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