Hamas' attack on Israel "is an act of sheer evil", US President Joe Biden has said, adding that he never really thought he would see "pictures of terrorists beheading children". "There are moments in this life -- I mean this literally -- when a pure, unadulterated evil is unleashed on this world," he said during a televised White House address earlier today. "This is an act of sheer evil," Biden added. Later, a White House official clarified to the BBC that Biden did not actually see such images, but was referring to "reports from Israel.