By Steve Holland WASHINGTON (Reuters) - U.S. Democrat Hillary Clinton on Wednesday broke her silence over a budding controversy involving her use of personal email for work when she was secretary of state, saying she wanted the U.S. State Department to release them swiftly. Clinton's statement was aimed at cooling a political firestorm over allegations that she inappropriately used her personal email for work while secretary of state from 2009 to 2013. The State Department said it will review the emails provided by Clinton "using a normal process that guides such releases." "We will undertake this review as quickly as possible. Clinton's tweeted statement came hours after a congressional committee investigating the Sept. 11, 2012, attack on a U.S. diplomatic facility in Benghazi, Libya, issued subpoenas for her emails.

Guinea and Sierra Leone reported 132 new confirmed cases of Ebola in the week to March 1, an increase of 34 over the previous week, the World Health Organization said on Wednesday. Liberia did not report any new confirmed infections in the week for the first time since May last year, but disease surveillance may not be optimal given the low number of samples, the U.N. agency said in its latest update on West Africa's epidemic. Only half of the 51 new infections in Guinea came from registered contacts of Ebola patients and some cases are only identified after post-mortem testing, it said. "The number of confirmed Ebola virus disease deaths occurring in the community in Guinea and Sierra Leone remains high, suggesting that the need for early isolation and treatment is not yet understood, accepted or acted upon," the WHO said in a statement.

By Lawrence Hurley WASHINGTON (Reuters) - The U.S. Supreme Court appeared sharply divided on ideological lines on Wednesday as it tackled a second major challenge to President Barack Obama's healthcare law, with Justice Anthony Kennedy emerging as a likely swing vote in a ruling. The nine justices heard 85 minutes of arguments in the case brought by conservative opponents of the law who contend its tax credits aimed at helping people afford medical insurance should not be available in most states. A ruling favoring the challengers could cripple the law dubbed Obamacare, the president's signature domestic policy achievement. Kennedy, a conservative who often casts the deciding vote in close cases, raised concerns to lawyers on both sides about the possible negative impact on states if the government loses the case, suggesting he could back the Obama administration.