The whistleblowing website WikiLeaks has revealed the Department of Homeland Security began monitoring the Occupy Wall Street movement soon after its inception last fall. An internal DHS report from October describes Occupy Wall Street as “a significant challenge for law enforcement.” The report also contains information apparently gleaned from Occupy-related Twitter feeds and progressive websites including the Daily Kos. It was released as part of the five million leaked emails obtained from the servers of the private intelligence firm Stratfor. In other Occupy news, at least 10 people were arrested on Wednesday in a march on the New York headquarters of the pharmaceutical giant Pfizer, as well as branches of Citibank and Bank of America. It was the second consecutive day of protests for Occupy Wall Street activists seeking to re-energize the movement heading into spring.