Who We're Fighting in Iraq

A top Pentagon official tells CNN the brass estimates between 13,000 and 17,000 insurgents are working in Iraq. He says the Defense Department believes most are loyalists to Saddam Hussein and his Baath Party. The Pentagon also believes about 500 more fighters came in from other countries and about 1,000 more are are believed to be followers of terrorist Abu Musab al-Zarqawi. (CNN)