Silicon.com reports signs that hackers attacked key parts of the backbone of the internet on Tuesday but no damage appears to have been done.
The attack appears to have focused on the domain name system (DNS). Several key DNS servers saw traffic spike in the early morning on Tuesday.
If part of the DNS system goes down, websites could become unreachable and email could become undeliverable. But DNS is built to be resilient, and attacks on the system are rare. In 2002, a similar denial of service attack also failed.