Instagram has reportedly been blocked in China, amid fierce clashes between pro-democracy supporters and police in Hong Kong.
The photo and video-sharing service, which is owned by Facebook Inc, has been put on lockdown by police, according to various sources. Reuters cited Hong Kong-based reporters with The New York Times as being among those to report the story.
The reports come as pro-democracy protesters, some wearing surgical masks and holding up umbrellas to protect against tear gas, expand their rallies throughout Hong Kong in protest against Beijing's decision to limit democratic reforms in the Asian financial hub.
Images of the clashes, which have been broadcast across the world, are undermining Hong Kong's image as a safe financial haven, and have raised the stakes of the face-off against President Xi Jinping's government.
Many of the photos have been labelled with the hashtag "Occupy Central," a phrase that was blocked on Sunday on Weibo, China's version of Twitter. It had been allowed earlier in the day.
China has called the protests illegal and endorsed the Hong Kong government's crackdown, but the social media blockade will not prevent users in Hong Kong from continuing to post on the site.
The Independent has contacted Instagram regarding the reports.
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