U.S. government agencies will hold a classified briefing for all senators on Wednesday on China's alleged efforts known as Salt Typhoon to burrow deep into American telecommunications companies and steal data about U.

The FBI and Cybersecurity and Infrastructure Security Agency say that Americans should use encrypted apps such as iMessage and FaceTime to be safe from foreign hackers.

U.S. officials reveal that Chinese hackers are still lingering inside telecom networks and it's difficult to say when they will be identified and removed.

U.S. government agencies will hold a classified briefing for all senators on Wednesday on China's alleged efforts known as Salt Typhoon to burrow deep into American telecommunications companies and steal data about U.

The Chinese government espionage campaign that has deeply penetrated more than a dozen U.S. telecommunications companies is the “worst telecom hack in our nation’s history — by far,” a senior U.S. senator told The Washington Post in an interview this week.

Salt Typhoon's breach compromises U.S. telecom giants, including T-Mobile, AT&T, and Verizon. The hack exposes vulnerabilities in U.S. wiretapping systems, threatening national security and potentially the data of millions of Americans. T-Mobile claims limited damage, but the full scope of the breach is still unclear.

U.S. officials say they're investigating Chinese government-affiliated hackers who compromised the networks of of U.S. communication companies and were able to intercept private communications of people affiliated with the U.

Federal authorities on Tuesday urged telecommunication companies to boost network security following a sprawling Chinese hacking campaign that gave officials in Beijing access to private texts and phone conversations of an unknown number of Americans.

US officials are still trying to help major telecom providers evict Chinese government-backed hackers from their networks and don’t have a timeline for when that will be done, officials said Tuesday.