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Fresh scuffles broke out on Saturday between Hong Kong pro-democracy protesters and opponents of the week-long demonstrations, reigniting concerns that the Chinese-controlled city's worst unrest in decades could take a violent turn.

When Secret Service officer Timothy McCarthy took a bullet to protect Ronald Reagan in a 1981 assassination attempt and agent Jerry Parr shoved the president into a limousine, their quick reflexes projected a Hollywood-style image of invincibility around the agency.

Brazilian President Dilma Rousseff continues to broaden her advantage ahead of Sunday's election, but it is not clear which of her rivals she will face in an expected second-round runoff, a new poll showed on Friday.