Privacy-focused messaging app Signal appeared to no longer be working in China without the use of a virtual private network (VPN), as reported by Reuters.

Signal’s website was also inaccessible in China on Tuesday morning.

The app was still available on Apple’s China app store as of Tuesday morning, and the app and website appeared to be working normally in Hong Kong.

Signal had been downloaded close to 510,000 times on iOS in China, and has been downloaded 100 million times worldwide on the App Store and Google Play combined, according to data company Sensor Tower.

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