China has slammed a decision by the U.S. Treasury to sanction a Beijing-based cybersecurity company for its alleged role in multiple hacking incidents targeting critical U.S. infrastructure, while the Chinese cyber security agency complained Monday of attacks on Chinese networks.

Hackers targeted around ten official websites in Italy on Saturday, including the websites of the Foreign Ministry and Milan's two airports, putting them out of action temporarily, the country's cyber security agency said.

The U.S. Treasury on Friday sanctioned a Beijing-based cybersecurity company for its alleged role in multiple hacking incidents targeting critical U.S. infrastructure.