(Reuters) - AT&T Inc said some business customers temporarily lost internet access because its network was targeted by unknown attackers on Wednesday.

Company spokesman Mark Siegel said that domain name system, or DNS, servers that direct traffic for AT&T customers were targeted at two locations by a distributed denial of service attack.

In such attacks perpetrators target a server with a lot of requests at the same time, making it unavailable to users.

The issue has now been resolved, he said.

(Reporting by Siddharth Cavale in Bangalore)