On Friday morning some major network sites including PayPal and Twitter suffered service disruptions for several hours. The internet infrastructure provider Dyn said it was hit by a cyber- attack that disrupted traffic mainly on the US east coast.

The outages were intermittent making it very difficult to identify all the victims because that began in US east coast and then spread to others part of the world.

 After Friday's outages users make complained that they were unable to reach dozens of internet destinations including the Wall Street Journal, the New york Times, Amazon Inc.

According to Dyn's director Dough Madory, "The attacks targeted Dyn, with a huge amount of traffic in an attempt to knock the service offline". The US Department of Homeland Security and FBI both were jointly investigating the recent outage.

The first digital outage has started in Friday morning and Dyn said it was resolved at around 9.20am. The second attack began 11.50am.And the third attack occurred in the afternoon, reported by The Sunday Morning Herald.

US department of Homeland Security issued a powerful warning in last week about a new approach for blocking access websites. According to Reuters report, the attackers used hundreds of thousands of internet-connected device with 'malicious code' that permitted them to cause outages that began in the US east coast and then spread to other parts of the world.

After the outage PayPal holding Inc. said the attack prevented some customers in making payments. Amazon.com Inc.'s web services division also disclosed an outage that lasted for several hours.

Dyn is a New Hampshire-based provider of service for managing DNS, which acts as switchboard connecting internet traffic. Dyn is the provider of world's biggest corporations and internet firms such as Pfizer, Visa, Netflix,Twitter, BT, and Sound Cloud.

The recent outage of a large DNS provider can create massive traffic disruptions because such internet firms are responsible for providing a large volume of internet services.

The company was probing to determine how the attack led to the outage, said by Dyn executive Vice President Scott Hilton.