India, Nov. 16 -- Some of America's biggest cybersecurity companies are struggling to handle a sharp rise in cyberattacks powered by artificial intelligence (AI). The situation has become so serious that companies are turning away new customers who need urgent help after being hacked.

Three major US cybersecurity firms - Google's Mandiant, CrowdStrike and Kroll - told NBC News that they are facing an unusually high number of cyberattacks. They said the volume of attacks has reached a level they have not experienced before.

The companies said that the biggest reason behind the growing number of attacks is the use of AI tools. These tools have made hacking operations much faster, easier and cheaper to carry out.

While hackers can now use...