Hackers used internet-connected home devices, such as CCTV cameras and printers, to attack popular websites on Friday, security analysts say.

Twitter, Spotify, and Reddit were among the sites taken offline on Friday.

Each uses a company called Dyn, which was the target of the attack, to direct users to its website. 

Dyn is a DNS service - an internet "phone book" which directs users to the internet address where the website is stored. Such services are a crucial part of web infrastructure.

On Friday, it came under attack - a distributed denial of service (DDoS) - which relies on thousands of machines sending co-ordinated messages to overwhelm the service.

The "global event" involved "tens of millions" of internet addresses.

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