Baghdad- US Secretary of State Hillary Clinton has arrived in the Iraqi capital on an unannounced visit, Voices of Iraq news agency reported on Saturday. The visit comes at a time as the new US ambassador to Iraq, Christopher Hill, is taking up his office.

The trip - Clinton's first to Iraq as secretary of state - also comes after 48 hours of suicide bombings in Baghdad and other cities which have killed at least 155.

President Barack Obama vowed to withdraw US combat troops from Iraqi cities by summer during a recent visit to Iraq.

Colombo, Apr 25 : Expressing deep concern over human rights violations and rising civilian causalities in Sri Lanka, the United States has called for an immediate ceasefire in the North-Eastern region of the country.

According to the BBC, United Nations humanitarian chief John Holmes is travelling to the island country to urge the Lankan Government to provide more aid to people trapped in the combat zone.

UN reports say that 160,000 people have fled the area, but 50,000 still remain.

Washington, Apr. 25 : Six in ten Americans are satisfied with Obama''s first 100 days in office

According to a FOX News poll, Obama''s job approval rating comes in at 62 percent, down just three points from the 65 percent approval he received after his first week in office. Twenty-nine percent of Americans disapprove.

In addition, most people say Obama is doing a better job than they expected (26 percent) or meeting expectations (56 percent). Few say he is doing worse than expected
(16 percent).

Washington, Apr 25 : Researchers from Dartmouth Medical School have come up with a novel approach for inhibiting relentless bacterial infections that thrive in the lungs of people with cystic fibrosis (CF).

The researchers have found that combining a mainstay antibiotic with certain drugs to deprive the bacteria of iron, which facilitates their persistent growth, appears to boost infection killing.

Washington, Apr 25 : Health experts from around the world have launched new guidance for countries and policy leaders on how and when to eliminate malaria.

The announcement would pave the way for the potential global eradication of the deadly disease.

The Malaria Elimination Group, a global body of researchers, policy experts and country program managers, by the Global Health Group of UCSF Global Health Sciences, is behind the launch of new guidelines.

Santa Barbara (California, US), Apr. 25 : Tibetan spiritual leader, the Dalai Lama, has praised American democracy and thinks President Obama is realistic and open.

In an exclusive interview with FOX News during his five-city tour of the United States, the Dalai Lama said: "I think basically America is a champion of freedom, democracy, liberty." ] "Occasionally the administration neglects these principles, but overall, I think these principles are very much alive in this country," he added.