Osama bin Laden attempted to communicate with Al Qaeda's front man in Iraq, Abu Musab al Zarqawi, a month ago through a letter that was seized when a ground courier in Pakistan was intercepted , an American counter-terrorism expert said here on Monday."About four weeks ago, we intercepted communication between Osama bin Laden and Zarqawi," which occurred when "a ground courier was intercepted," Bob Newman, director of international security and counter-terrorism services with The GeoScope Group, told an Airport, Port and Terminal Security (APTS) Middle East conference. "We (US intelligence) intercepted the man and looked in his pockets. That's how we found out," he added.