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WASHINGTON， Oct. 21 (Xinhua) -- Twitter， PayPal and some other major United States websites were shut down temporarily on Friday as American Internet infrastructure companies Dyn and Amazon were hit by waves of cyber attacks.


Dyn， headquartered in New Hampshire， said in posts on its website that its Domain Name System (DNS) infrastructure suffered three waves of distributed denial of service (DDoS) attacks， which flooded it with traffic from multiple sources to make it inaccessible.


The company said the first wave was a "large" DDoS attack that started at 7:10 a.m. EDT (1110 GMT) and mainly affected the U.S. east coast.


"Dyn's engineers were able to successfully mitigate the attack at approximately 13:20 UTC (1320 GMT)， and shortly after， the attack subsided，" it said.


Compared with the first wave， the second one that started at about 11:50 a.m. EDT (1550 GMT) and lasted until 1:00 p.m. EDT (1700 GMT) was "distributed in a more global fashion，" with affected customers possibly seeing "intermittent resolution issues as well as increased global latency，" according to the company.


At around 4:00 p.m. EDT (2000 GMT)， Dyn reported a third DDoS attack， which it said had been "resolved" a little over two hours later.


Amazon Web Services (AWS)， a unit of Amazon that hosts many of the web's popular destinations including Netflix， also reported an attack that affected people on the U.S. east coast around the same time in the morning.


"Between 4:31 a.m. (1131 GMT) and 6:10 a.m. PDT (1310 GMT)， we experienced errors resolving the DNS hostnames used to access some AWS services in the US-EAST-1 Region，" the company said on its website.


But this issue has been resolved and the service is now operating normally， it noted.


The attacks reportedly kept many users in the United States and parts of Europe from accessing Twitter， PayPal， Reddit， Spotify， Netflix and other sites.


Digital payments company PayPal was one of the companies that admitted experiencing brief service interruptions due to the attacks.


"We're sorry for the inconvenience，" PayPal tweeted.


White House spokesman Josh Earnest said the U.S. Department of Homeland Security is monitoring this situation and will take a close look at it.


"But at this point， I don't have any information to share about who may be responsible for that malicious activity，" Earnest told reporters.


A senior U.S. intelligence official told NBC News their current assessment is that this is "a classic case of internet vandalism."


The official was quoted as saying that it does not appear at this point to be any kind of state-sponsored or directed attacks.


A group called New World Hackers claimed responsibility for the attacks via Twitter， although their claims cannot be independently verified.


In its Twitter account， the group retweeted a tweet from a person who spoke with it， saying the attacks were "a test of attack power" and that "their main enemy is Russia."

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The United States has lifted the in-cabin ban on laptops and other large electronic devices on US-bound flights from Dubai and Istanbul Authentic Tim Heed Jersey , Emirates and Turkish Airlines said on Wednesday.


The announcements come three days after the ban was lifted on Etihad Airways' flights to the United States from Abu Dhabi International Airport.


The ban on US flights from Dubai International, the world's busiest airport for international travel, has been lifted after new security measures announced by the US last week were implemented Authentic Melker Karlsson Jersey , an Emirates spokeswoman said in a statement.


Emirates, the Middle East's largest airline and which flies to 12 US cities, had blamed travel restrictions imposed by President Donald Trump's administration for a drop in demand on US flights.


The Dubai-based carrier cut flights to five US cities from May but had since said demand was starting to return on some routes.


Meanwhile Turkish Airlines said in a statement that passengers traveling to the United States could now take their laptops onboard.


Emirates and Turkish Airlines are the only airlines that operate direct flights from Dubai and Istanbul Authentic Kevin Labanc Jersey , respectively, to the US.


Turkish Airlines Chief Executive Bilal Eksi also tweeted that the airline expected similar restrictions on flights to Britain would soon be lifted.


""A technical team will come from Britain for an assessment within one week,"" Turkey's Transport Minister Ahmet Arslan told reporters in the capital Ankara. ""I'm sure they will lift that ban. There is no reason for the ban to continue.""


US and British officials carried out inspections of security measures at Istanbul's Ataturk Airport on Tuesday Authentic Justin Braun Jersey , the Dogan news agency reported earlier.


There was no immediate comment available from US officials on the lifting of the ban in Dubai and Istanbul.


Security officials were seen examining passengers' laptops at Istanbul's Ataturk Airport on Wednesday following the lifting of restrictions.


""When I was buying the ticket I thought 'shall I buy one for the day after just in case', but I bought one for today when they said it was being lifted,"" Emre Tokmak Authentic Chris Tierney Jersey , a passenger on a Turkish Airlines morning flight to New York traveling with his laptop, told reporters at the airport.


In March the United States imposed the ban on direct flights originating at 10 airports in eight countries - Egypt, Morocco Authentic Tomas Hertl Jersey , Jordan, the United Arab Emirates, Saudi Arabia Authentic Martin Jones Jersey , Kuwait, Qatar and Turkey - to address fears that bombs could be concealed in electronic devices taken aboard aircraft.


Some airlines affected by the ban tried to soften the impact of the restrictions by allowing passengers to check in banned devices shortly before boarding and offering to loan tablets for use during the flight to those travelling in first or business class.

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