Investigators were reportedly looking into family connections in their search for a motive in Friday's shooting rampage in Santa Monica, Calif., that left six people dead, including the gunman and a woman who died Sunday from injuries sustained in the assault.
A two-day summit between President Obama and his Chinese counterpart, Xi Jinping, is being described as a "unique, positive and constructive" meeting that reportedly produced broad agreement on handling North Korea and put the thorny issue of cybersecurity at the forefront.
It was hoped the summit, which wrapped up Saturday in California, would be an opportunity for the two men to establish a personal relationship weeks after Xi assumed the presidency in China.
In the past several days, there's been a steady flow of leaks about the National Security Agency and its secret surveillance activities, including the gathering of metadata on domestic and foreign telephone calls and the existence of PRISM, described in media reports as a top-secret data-mining program.
New developments are occurring on a daily basis. Here are a few we're watching right now: