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• NAIROBI, Kenya (AP) -- U.N. investigators discovered a mass grave in a rebel-held city in South Sudan, the United Nations said Tuesday, as a possible opening occurred for negotiations to avert civil war in the world's newest country where ethnic violence has erupted.
• In New York, the U.N. Security Council voted unanimously to beef up its peacekeeping force in South Sudan. It condemned targeted violence against civilians and ethnic communities and called for "an immediate cessation of hostilities and the immediate opening of a dialogue."
• The government, meanwhile, announced that its military forces had taken back another key city, Bor, from the rebels who held it over the last week.
• The bodies were found in the town of Bentiu in oil-rich Unity state: one grave with 14 bodies and a site nearby with 20 bodies, said U.N. human rights office spokeswoman Ravina Shamdasani.
• The government minister of information, Michael Makuei Lueth, said Bentiu is under the control of rebels loyal to the country's former vice president, Riek Machar, indicating they were responsible for the killings.
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• CHICAGO (AP) -- The government's retooled health care website was put to its biggest test yet as record numbers of Americans rushed to beat Tuesday's extended deadline for signing up for insurance.
• After a disastrous, glitch-filled rollout in October, HealthCare.gov, where people in 36 states can shop for coverage, received 2 million visits Monday, its highest one-day total, the government said.
• Traffic was not as heavy on Tuesday but still high, White House spokeswoman Tara McGuinness said. She had no immediate estimate of visitors or how many succeeded in obtaining insurance before the midnight deadline.
• "The site is performing well under intense consumer traffic," said Kurt DelBene, a former Microsoft executive appointed last week to take over management of the online marketplace. "With the highest volumes we have seen to date, response time

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