On Thursday, police reportedly raided the Moscow office of the web server company NGINX, and the authorities are said to have detained two of of the company's cofounders.

NGINX was acquired by F5 Networks earlier this year for $670 million.

This raid happened soon after the parent company behind Russian search engine giant Rambler reportedly filed a copyright claim over NGINX's web server code.

NGINX cofounder Igor Sysoev wrote the original web server code while he was working for Rambler in the 2000s, and made it available as open source in 2004.

An F5 Networks spokesperson said that "Russian police came to the NGINX Moscow office," but declined to comment further, saying the company is still gathering the facts.

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Earlier on Thursday, Russian police raided the Moscow office of NGINX (pronounced "Engine-X"), a web server company that was acquired earlier this year by F5 Networks, ZDNet's Catalin Cimpanu reported.

During the raid, NGINX cofounders Igor Sysoev and Maxim Konovalov were detained, ZDNet reported.

"Earlier today, Russian police came to the NGINX Moscow office," an F5 spokesperson said. "We are still gathering the facts and as such we have no further comments to make at this time."

The reported raid came a week after Rambler Group, the parent company behind Russian search engine giant Rambler, is said to have filed a copyright violation claim against NGINX, claiming full ownership of the company's web server code.

Sysoev wrote the original NGINX web server code while working at Rambler in 2000s, ultimately releasing it as open source in 2004. He ultimately left Rambler and cofounded NGINX, the company, in 2011. ZDNet reports that Rambler claims it's the rightful owner of NGINX's code because the project was created while he was still working there.

"We have discovered that exclusive right of Rambler Internet Holding upon web-server of NGINX has been violated as a result of third-party actions," the Rambler Group press office said in a statement. "Concerning this, Rambler Internet Holding transferred the rights of submitting claims against NGINX to Lynwood Investments CY Ltd, which has necessary competences for providing justice in ownership issues."

NGINX is massively popular, representing the most widely-used web server technology on the internet, according to tracking firm Netcraft — outstripping prominent alternatives from the likes of the Apache Foundation, Microsoft, and Google. In March, F5 Networks acquired NGINX for $670 million.

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