The website of the New York Times has been taken offline by what the company describes as a malicious external attack targeting its hosting service.
It's the second time this month, the BBC reports.
The company says it suspects the attack was carried out by a hacking collective known as the Syrian Electronic Army, which analysts say supports the president, Bashar al-Assad.
The website was partially back online three hours after the attack, at 3pm on Tuesday, although some users still reported difficulties.
During the outage the New York Times published new articles on its Facebook page as well as a mirror site.
Chief information officer Mark Frons warned employees the attack was perpetrated by the Syrian Electronic Army, which backs Mr Assad, "or someone trying very hard to be them", the BBC reports.
He cautioned staff to "be careful when sending e-mail communications until this situation is resolved".