US Government Hacked; Data of 4 Million Federal Employees Exposed; China Might Be Behind The Hack

US government was recently hacked, in which data of approximately four million former and current federal employees may have been compromised, according to an announcement made by administration.

US investigators said this could be the biggest breach over federal government's computer networks ever.

Investigators believe this could be China's work. However, China called the allegation irresponsible.

The Office of Personnel Management, the federal government's human resources office, warned it was urging potential victims to monitor their financial statements and lookout for any financial fraud.

The breach was initially thought to have impacted the Office of Personnel Management and the Department of Interior, But government officials said nearly every federal government agency was hit by the hackers, according to CNN.

"Cyberattacks conducted across countries are hard to track, and therefore the source of attacks is difficult to identify. Jumping to conclusions and making hypothetical accusation is not responsible and counterproductive," objected Zhu Haiquan, spokesman from the Chinese Embassy in Washington.

Employees of the legislative and judicial branches and uniformed military personnel are reportedly unaffected.

FBI is investigating what led to the breach.

"We take all potential threats to public and private sector systems seriously and will continue to investigate and hold accountable those who pose a threat in cyberspace," the FBI said in a statement.

The federal personnel office said "personally identifiable information" had been breached, though the office didn't name who might be responsible.

"It is disturbing to learn that hackers could have sensitive personal information on a huge number of current and former federal employees -- and, if media reports are correct, that information could be in the hands of China," Senate Homeland Security and Governmental Affairs Chairman Ron Johnson, R-Wisconsin, said in a statement. "(The office) says it 'has undertaken an aggressive effort to update its cybersecurity posture.' Plainly, it must do a better job, especially given the sensitive nature of the information it holds."