During a presidential campaign in New Hampshire, US Democratic presidential candidate Hillary Clinton accused China of hacking into American systems and stealing commercial secrets.

The accusation has come in the wake of a recent case involving Chinese hacking of a US government agency, which contains at least 4.2 million records of current and former government workers.

However, the country denied the allegations of its involvement in the hacking of the US Office of Personnel Management.

Clinton’s approach was considered to be too strong than the ones used by President Barack Obama’s Democratic administration.

Reuters cited Clinton as saying: "But we also have to be fully vigilant, China‘s military is growing very quickly, they’re establishing military installations that again threaten countries we have treaties with, like the Philippines because they are building on contested property."

"They’re also trying to hack into everything that doesn’t move in America. Stealing commercial secrets … from defense contractors, stealing huge amounts of government information, all looking for an advantage." added Clinton.

The country has been accused of hacking into US systems previously too. In October last year, the FBI warned companies and government agencies in the US about an attack launched by Chinese government backed hackers.