Despite a recent pact between Chinese President Xi Jinping and President Obama to stop cyber war, security services provider, CrowdStrike, has reported that several Chinese state-backed hackers have been carrying out cyberattacks on several U.S. companies, according to NBC.

CrowdStrike claims that they have blocked every attack that they have come across so far and that the hackers seem to be targeting the networks of U.S. technology and pharmaceutical companies.

Just a few weeks ago, Xi visited the United States, promising leaders of American technology companies that the cyber attacks would stop. He also signed an agreement with President Obama that China and the United States would refrain from continued hacks that were aimed at obtaining company trade secrets for commercial advantage.

But two days after the agreement there were two attacks on technology companies, and more hacking attempts have happened since then.

“Seven of the companies are firms in the technology or pharmaceuticals sectors, where the primary benefit of the intrusions seems clearly aligned to facilitate theft of intellectual property and trade secrets, rather than to conduct traditional national-security related intelligence collection which the Cyber agreement does not prohibit,” CrowdStrike wrote in a blog post Monday.

If the cyberattacks continue it could lead to sanctions being placed against Chinese companies according to the agreement made between Xi and Obama.

The U.S. has also been accused of attempting to hack the networks of Chinese companies. Edward Snowden, former NSA contractor, came forward with information on how the U.S. hacked Chinese company, Huawei last year. Government officials continue to state that the reason for the hack was for national security purposes, not economic advantages.

The Chinese government has not made any comments regarding these attacks at this time.