After police forced marchers from the street onto the sidewalk, some responded by sprinting away from police, knocking over chairs, garbage cans and throwing cans into the middle of the streets. They threw police barricades into the middle of Broadway in an attempt to impede traffic.
Letters containing a white powder that appeared to be corn starch were sent to some institutions. Two letters were received Tuesday at News Corp. headquarters — one addressed to the Wall Street Journal — and a third was delivered to Citigroup. Their message said: "Happy May Day."
Seven letters were received Monday at various banks and one was sent to Mayor Michael Bloomberg.
"This is a reminder that you are not in control. Just in case you needed some incentive to stop working," the letters read, according to authorities.
A group also picketed outside New York University to protest the university's expansion plans in Greenwich Village.
Associated Press writers Meghan Barr, Samantha Gross and Colleen Long and Associated Press videographer Bonny Ghosh contributed to this report.
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