Yahoo is buying online blogging forum Tumblr for $1.1 billion as CEO Marissa Mayer tries to rejuvenate an Internet pioneer that had fallen behind the times.

The penalty phase of the Jodi Arias murder trial wrapped up for the day Monday after a series of legal arguments in which her defense lawyers asked for a mistrial and to withdraw from the case.

Here is a look at the deadliest attacks in Iraq since the withdrawal of U.S. troops on Dec. 18, 2011:

The college student was being held in a headlock by a masked intruder with a loaded gun to her head, police said. Then the gunman took aim at an officer.

Pakistan's presumptive prime minister called for peace talks with Taliban militants at war with the government Monday, potentially charting a course that could put him at odds with the country's powerful army.

Nelson Mandela, old and frail, lives in seclusion in his Johannesburg home. Beyond the high walls of the house, the fighting over his image and what he stood for has already begun.

The Obama administration is calling on the Egyptian government to rein in prosecutions of political expression amid what it called a "growing trend" of efforts to punish and deter people from speaking their mind.

The penalty phase of the Jodi Arias murder trial wrapped up for the day Monday after a series of legal arguments in which her defense lawyers asked for a mistrial and to withdraw from the case.

In a bitter fight, Colorado Democrats recently muscled through the Statehouse a massive elections reform bill that allows voters to register up until Election Day and still cast their ballots.

The State Department appointed a special envoy to monitor and combat anti-Semitism Monday as a new report documents a global increase in incidents of anti-Semitism and Holocaust denial.

When Lindsay Carter heard on the radio that a violent storm was approaching her rural Oklahoma neighborhood, she gathered her belongings and fled. When she returned, there was little left.

It could be an anxious wait of up to two months for people in a small Florida city to find out who won the highest Powerball jackpot in history: an estimated $590.5 million.

When Lindsay Carter heard on the radio that a violent storm was approaching her rural Oklahoma neighborhood, she gathered her belongings and fled. When she returned, there was little left.

It could be an anxious wait of up to two months for people in a small Florida city to find out who won the highest Powerball jackpot in history: an estimated $590.5 million.

Cardinal Sean O'Malley skipped Boston College's commencement Monday because of the involvement of Irish Prime Minister Enda Kenny, who supports a bill in his country that would allow abortion.

The Supreme Court said Monday it will hear a new case on the intersection of religion and government in a dispute over prayers used to open public meetings.

Connecticut commuters endured slow trips to work Monday following last week's train collision that injured 72 people and disrupted rail service into New York City.

Fierce street fighting in a Syrian town near the Lebanese border has killed at least 28 elite members of Lebanon's militant Hezbollah group, activists said Monday, as Syrian government forces pushed deeper into the strategic, opposition-held town.

A wave of attacks killed at least 86 people in Shiite and Sunni areas of Iraq on Monday, officials said, pushing the death toll over the past week to more than 230 and extending one of the most sustained bouts of sectarian violence the country has seen in years.

The Supreme Court has affirmed the authority of federal regulators to try to speed local government decisions on proposals to build or expand cell phone towers.