The movement that began in opposition to corporate excess and greed is now costing taxpayers nationwide millions of dollars, according to a new Associated Press poll.
    
The Associated Press surveyed 18 cities with active Occupy Wall Street movements, focusing on costs through Nov. 15.

Researchers found that taxpayers are paying at least $13 million for police overtime and other municipal services -- about the same amount it costs police to handle major public events and emergencies. 

The movement has cost Oakland, Calif., more than $2.4 million, to the dismay of city officials.

"The cost of the encampments is growing and putting a strain on our already fragile resources -- police, public works, and other city staff," said Oakland Mayor Jean Quan.

"We will continue to be vigilant and ensure that public safety remains our first priority and that our downtown businesses are protected from vandalism," the mayor added.

"We will not tolerate lodging on public property, whether in parks or open space," Quan said. "It is illegal."