The defaced page was in an area of his company's Web site that allows individuals to post Web pages for free. The site is commonly used to host family Web pages, he said.
While NetWORLD requires users to register with the company before posting pages on the site, the company does not corroborate the registration information.
In the case of the defaced page, the registration information that was provided was "fictitious," according to Bowman.
NetWORLD staff removed the defaced page at 4:30 p.m. GMT on Thursday, and had no information on who may have posted the page, he said.
For AlSeddiqi, the domain hijacking is just the latest in a series of attacks since the beginning of the war between the U.S. and Iraq.
The network's Web sites have been crippled by distributed denial of service attacks, which began shortly after the network posted pictures of U.S. soldiers who had been captured by Iraq.
Al-Jazeera was hoping to have traffic flowing back to its Web servers by Thursday evening, but remained concerned about the possibility of further attacks from hackers who were sympathetic with the U.S. and hostile to Al-Jazeera's sometimes critical coverage of the U.S.-led attacks on Iraq.
"Its been a very hard week. We get out from one problem and we run into another," AlSeddiqi said. "We don't know what they're going to do next."