Here (boldface mine):

...Intelligence officials have already tied Zarqawi to dozens of attacks worldwide, including the al Qaeda-linked suicide attacks in Istanbul, last year's bombing of the U.N. headquarters in Baghdad, as well as attacks on the Jordanian Embassy in Baghdad.

In an intercepted letter that Zarqawi is believed to have authored, he claims credit for at least 25 attacks in Iraq alone.

But an intelligence official told ABC News the Jordanian-born terrorist was also involved in plans to attack much closer to home.

According to the official, Zarqawi had direct ties to the millennium bombing plot of December 1999 to blow up buildings in Jordan, Israel and the United States. The group leader of the millennium plot was said to be acting on direct orders from Zarqawi.

Training Under Bin Laden

During the 1990s, Zarqawi trained under bin Laden in Afghanistan. After the fall of the Taliban, he fled to northwestern Iraq and worked with poisons for use in potential attacks, officials say.

During the summer of 2002, he underwent nasal surgery at a Baghdad hospital, officials say. They mistakenly originally thought, however, that Zarqawi had his leg amputated due to an injury.

In late 2002, officials say, Zarqawi began establishing sleeper cells in Baghdad and acquiring weapons from Iraqi intelligence officials.

Officials believe that Zarqawi travels freely throughout the region, but right now, they have no idea where he might be.