TalkTalk and Post Office internet customers were knocked offline this week because of a cyber attack on their routers. According to BBC News, the Post Office said the incident began on Sunday and affected around 100,000 customers, which TalkTalk did not say how many users were hit.

It is not known who was behind the attack, but it came at the same time as a Mirai-linked attack on German internet users’ routers that took 900,000 people offline.

As of Friday morning, TalkTalk appeared to have issued a fix for the issue, which was marked as “resolved” in a support message posted to its website.

“We are aware some customers have lost connectivity to the internet and have a red light showing on the router,” it said. “If you have been impacted by this issue please reboot your router by switching it off and on again which should resolve the problem.”

The incident has been linked to Mirai, the Internet of Things-hijacking malware behind the botnet that launched a huge cyber attack on DNS provider Dyn last month. TalkTalk told the BBC it was taking additional steps to improve security.

“Along with other ISPs in the UK and abroad, we are taking steps to review the potential impacts of the Mirai worm,” a spokesperson said. “We have deployed additional network-level controls to further protect our customers.”

Cyber security experts have warned that if the IoT is not properly secured, the world could see an increasing number of attacks against critical infrastructure systems.

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