Polls show that Brazil's incumbent President Dilma Rousseff is likely to face stiff competition from challenger Aecio Neves in Sunday's presidential run-off. Around 143 million people are eligible to vote.
Authorities in New York City have classified a hatchet attack against four police officers as an act of terrorism. The alleged perpetrator was a recent convert to Islam.
New York and New Jersey have imposed a mandatory quarantine on medical workers who had direct contact with Ebola patients in West Africa. The decision comes after a US doctor tested positive for the deadly virus.
Economic questions could end up deciding the Brazilian election. But analysts say it won't work the other way round - economic development is unlikely to be affected by the outcome of the run-off.
An executive from Google has broken the record set by an Austrian skydiver in 2012, jumping from more than 25 miles above the Earth's surface. Alan Eustace was part of a project to develop commercial spacesuits.
A teenage gunman has killed himself and a fellow student at a high school north of Seattle, Washington state. At least four other people have been hospitalized with serious head injuries.
Multiple students have been wounded in a school shooting near the US city of Seattle. The gunman, a student, is understood to have taken his own life.
The gruesome murder of a citizen journalist in Mexico published on Twitter points to deep-rooted impunity - but it also shows how social media can continue to play an important role for freedom of information.
A doctor who recently returned to New York City after treating patients with Ebola in Guinea has tested positive for the disease. Three contacts of the man are under observation
Four weeks after the alleged massacre in Iguala, the perpetrators have been named and warrants issued for their arrest. But the protests will continue - rightly so, says DW's Uta Thofern.
Mali has reported its first confirmed case of Ebola, making it the sixth West African country to be affected. Health officials in New York have said a doctor who had worked in Africa is being tested for the virus.
Canadian police officials have said Wednesday's gunman, who caused a lockdown for hours in Ottawa, likely acted alone. Officials say they are maintaining increased vigilance.
Canadian lawmakers have returned to the federal parliament in Ottawa, a day after a gun attack inside the building. There was a standing ovation for the parliament's sergeant-at-arms, who took down the gunman.
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