The president calls the terror attacks in New York and Washington acts of war, and the White House says the president himself might have been a target.

Ongoing series of articles, related news and audio files.

The number of those killed or unaccounted for after Tuesday's suicide attacks grows to more than 5,000 as authorities scramble to unearth the dead and track down the living. (As of article writing).

With telephone and wireless services in disarray, people resort to communicating via e-mail, instant messaging and the Web.

U.S. stock markets will remain closed for a third day following the deadly attack that destroyed the World Trade Center in Manhattan's financial district.

"On America Online chat boards, interspersed between expressions of sympathy and intense discussions of the meaning and cause of the tragedy, Besharat said he saw many people venting anti-Arab hatred."

Akamai, MRV Communications, Metrocall, Netegrity, Oracle, eLogic, Raytheon, Sun, Nextwave, BEA Systems and 3Com confirm executives and employees were killed in Tuesday's attacks.

Sun tracks down all of its 340 workers based in the World Trade Center but learns that one Massachusetts employee died in a hijacked plane.

The hunt for the terrorists behind Tuesday's attack leads to America Online and EarthLink, both of which have handed over information to the FBI.

Flights will resume on a case-by-case basis effective 8 a.m. PDT as more stringent levels of security are implemented.

As the smoldering ashes of the World Trade Center slowly yield unimaginable carnage, investigators fan out across the country to track the conspirators who orchestrated an unprecedented day of terror.

Web sites are swamped as people seek information about the terrorist attacks in New York and Washington, D.C. Also: Where to go on the Net to find out more.