Downtown Manhattan, the city's party mecca, has been hit by an alarming spike in vicious street violence. Assaults in Greenwich Village lead the frightening upturn, with a whopping 43 percent increase so far this year compared with the same period in 2008. "I've never seen it like this before -- never, ever," said G. Simon Chafik, a female photographer who has lived in Manhattan for 15 years. "I'm a big New Yorker. New York is one of the safest cities. [But] I'm beginning to question that." Other hot Manhattan neighborhoods tainted by the crime wave include TriBeCa, with a nearly...