The Syrian Electronic Army, loyal to the regime of President Bashar al-Assad, has claimed responsibility for the attack, according to news reports.
The Times website, once it was restored, prominently featured this update on its home page:
To Our Readers
Our Web site was unavailable to users in the United States for a time on Tuesday. The disruption was the result of an external attack on our domain name registrar, and we are at work on fully restoring service. We regret if this has caused you any inconvenience.
— The New York Times
The hack to Twitter was a little more complicated.