The New York Times website has gone offline for the second time this month after what the company described as a "malicious external attack". On its Facebook page, the Times said it was working to fix the outage, which appears to have started at 15:00 local time (19:00 GMT) on Tuesday.
A technical problem knocked NYTimes.com offline on 14 August.
Analysts said evidence showed a group supporting Syrian president Bashar al-Assad was behind Tuesday's attack.