Thousands of protesters marched through downtown Chicago on Sunday in one of the city's largest demonstrations in years, airing grievances about war, climate change and a wide range of other complaints as world leaders assembled for a NATO summit.

Millions turned their eyes to the sky on both sides of the Pacific as a solar eclipse created a "ring of fire" from Asia to the western United States, where it was greeted with whoops in California.

Yahoo Inc. has agreed to sell half of its 40 percent stake in Chinese e-commerce group Alibaba for about $7.1 billion, and the struggling U.S. Internet company said it would return most of the cash to shareholders.

Pakistan restored access to Twitter after briefly blocking the microblog over "blasphemous" posts about a Facebook competition involving caricatures of the Prophet Mohammed.