Up to 10,000 webcams will be recalled in the aftermath of a cyber attack that blocked access last week to some of the world’s biggest websites, Chinese manufacturer Hangzhou Xiongmai Technology Co told Reuters on Tuesday.

In Washington, a member of the US Senate Intelligence committee asked three federal agencies what steps the government can take to prevent cyber criminals from compromising electronic devices.

In a new type of attack last Friday, hackers harnessed hundreds of thousands of webcams and other connected devices globally to flood US-based internet infrastructure provider Dyn with so much traffic that it could not cope, cutting access to websites including PayPal, Spotify and Twitter.

Hangzhou Xiongmai said it would recall some surveillance cameras sold in the United States after researchers identified they had been targeted in the attack.

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