On the eve of Occupy Wall Street's May Day, New York City Police were investigating seven separate incidents of packages or envelopes containing suspicious white powder reported at locations around Manhattan, including one addressed to Mayor Michael Bloomberg.


One of the letters was also sent to Mayor Michael Bloomberg. The letter to the mayor never made it to City Hall, but was instead opened in a mail room at 100 Gold Street, according to The New York Times.


The mail room employee who opened it was isolated as a precaution; nobody was injured in the incident.


The white powder in all the instances was cornstarch, officials told the New York Post.


Earlier, Wells Fargo & Co. said it had closed three of its bank branches after they received suspicious envelopes containing white powder. At least five Wells Fargo branches received the standard-size envelopes filled with white powder, as did the Park Avenue headquarters of JP Morgan Chase.


In two of the letters sent to the banks, a note was found inside that read, "This is a reminder that you are not in control. Just in case you needed some incentive to stop working. We have a little surprise for you. Think fast. Happy May Day," according to the Times, leading officials to suspect the white powder was sent by someone affiliated with the Occupy Wall Street movement.

OWS said the white powder was not part of their plans for today.

No arrests have been made in the cases.