The World Health Organization, the United Nations health agency, uses a system of six phases to warn of possible influenza pandemics.

VOA: special.2009.05.06

The messages began to warn of trouble.

VOA: special.2010.05.26

Rebecca Chiao says harassmap.org will help warn the public about areas where there is a high risk of harassment.

VOA: special.2010.11.29

Carlo Urbani was the first doctor to warn the world of the disease that became known as SARS.

VOA: special.2009.01.27

Even today many citizens of San Francisco warn visitors never to call the great city Frisco.

VOA: special.2009.12.14

He got a metal shovel and hit the stone sides of the house so that the noise would warn the birds and animals of danger.

VOA: special.2010.03.20

Other products warn drivers if they are falling asleep or in danger of an accident.

VOA: special.2010.01.08

In many countries, it is possible to buy and use a special device that will warn when harmful levels of carbon monoxide are in the area.

VOA: special.2010.02.02

Based on the results, researchers advised doctors and parents to warn young women about the risk of wrinkles as a more effective way to prevent tanning bed use.

VOA: special.2010.07.06

They observe the movement of lions and warn herders of their presence.

VOA: special.2009.05.05

They warn that the amount of junk in Earth's orbit is increasing and, as it does,the risks to satellites and space vehicles,also rise.

VOA: standard.2010.07.24

He came to warn us about James. This isn't my fight,and I've grown tired of his games, but he's got unparalleled senses,absolutely lethal.

VOA: standard.other

Analysts warn Turkey could be on the verge of again descending into a spiral of violence.

VOA: standard.2010.06.17

However,both organizations also warn patients to make sure they choose certified doctors and surgeons at health care institutions that have met high standards of accreditation.

VOA: standard.2010.04.08

Despite recent wet weather across much of the continent, climatologists warn that a looming El Nino pattern could bring drier conditions to Australia in the coming months.

VOA: standard.2009.06.24

Diplomats and observers warn that this could be the deadliest phase of the war, as the army tries to target the rebels mixed in the civilian population.

VOA: standard.2009.04.06

However,critics warn that without freedom of expression, reconciliation is doomed to failure.

VOA: standard.2010.07.06

Scientists warn the impact of climate change is hitting the world faster than previous predictions by Pachauri's IPCC, which amounts to a more conservative consensus of top world researchers.

VOA: standard.2009.03.12

Republicans oppose the Obama health care approach as too costly and warn the administration plan could affect the quality of care for those who already have health insurance coverage.

VOA: standard.2009.08.12

Political analysts warn that the timing of Mr.Brown's appearance will be unwelcome for many in his Labor party forcing the party to revisit an issue that was damaging in the last election.

VOA: standard.2010.01.22

As Yemen battles al-Qaida in the Arabian Peninsula, a Southern separatist movement, and tries to wrap up a six-year old war in the north, Western governments warn their citizens to stay out of the country, scaring off tourists and investors.

VOA: standard.2010.04.20

"So while we're not really forecasting another meltdown, we're more in the correction camp, you certainly have to warn investors that it is a possibility, we could be in for maybe a slightly smaller version of the roller coaster that we went through in 2008."

VOA: standard.2010.05.21