Al Jazeera DOSed or just lots of traffic

Al Jazeera's web site (www.aljazeera.net) has been intermittently unavailable today. Al Jazeera's spokesperson indicated it might be hackers, but it could have just been lots of people trying to reach the web site to see the pictures US television networks wouldn't broadcast, overloading their servers. That's the only "high visibility" problem I've heard of so far. There has been the normal background level of stuff on the net, cable cuts, web defacements, perpetual ddos attacks, etc.