American tech companies Facebook, Twitter, Microsoft and Google do not release information about the online distribution of video footage of the deadly attack in the German Halle earlier this month. Reuters reports that.

Earlier this year, the companies promised more transparency after an attack in Christchurch, a city in New Zealand. The shooting was broadcast live via a stream on Facebook. Social media then promised to take joint measures to ensure that violent images would be massively distributed after an attack.

The attack in Halle was the first major test of that joint system. The incident was broadcast live on Amazon's game streaming service Twitch. Twitch says that five people saw the attack in Halle live. Then another 2,200 people watched the video before the company took the video offline.

According to the Global Internet Forum to Counter Terrorism, a group founded by Facebook, Twitter, Microsoft and Google, the images in Halle online had "significantly less impact" than that of the attack in Christchurch.

Nothing is known about the effect of blockages

The companies shared 'digital fingerprints' of 36 videos with each other that were linked to the attack in Germany. That data was then blocked to prevent further spread. The attack in New Zealand involved eight hundred digital fingerprints that were distributed to recognize videos.

However, there is no information available about how many people have seen the images in Halle scattered across social media and how many videos were automatically deleted. According to Reuters , it is therefore difficult to determine what the results of the new approach are.

Of the companies, only Twitter responded to questions from Reuters . The network says to release information about the erasure of terrorist content twice a year in a transparency report. "Furthermore, we now have nothing to share."

After the attack in Christchurch, Facebook removed around 1.5 million videos. More than 1.2 million of these were already stopped during the upload.