And today, Secretary Napolitano and the Attorney General Eric Holder are formalizing a joint task force between the Department of Homeland Security and the Department of Justice that will leverage the investigative capabilities of both agencies to work with Mexico in tracking down the perpetrators.

WHITEHOUSE: Press Briefing

"In an immense show of force, police have shown their presence, " said Kanene Holder, a spokeswoman for the Occupy Wall Street movement.

CNN: New York court upholds eviction of Occupy protesters

In a heated exchange with Senator Ted Cruz during a hearing earlier in the day, Mr Holder said it was not appropriate to use lethal force - "drones, be it guns or whatever else" - on a US citizen.

BBC: US & Canada