"This requires a close relationship between military and law enforcement, " said Michael Vatis, an FBI official who also spoke at the conference.

CNN: U.S. Army kick-starts cyberwar machine

Vatis said the growing bullets-and-guns conflict in the Middle East between Israel and the Palestinians, with Islamic supporters elsewhere, is being accompanied by cyberattacks from each side against the other.

CNN: U.S. Army kick-starts cyberwar machine

"There really is a broad spectrum of people, groups and countries that engage in cyber-attacks as a general matter for different purposes, " said Michael Vatis, director of the National Infrastructure Protection Center at the FBI.

CNN: Governments ready to fight cyber-crime in new millennium