American energy technology company Itron has confirmed it was hit by a cyberattack in mid-April and that hackers had gained access to some of its systems.

In a legally required filing with the U.S. Securities and Exchange Commission late on Friday , Itron said it was “notified” that it had an intruder in its systems. The company did not say who notified it, but added that it subsequently expelled the hackers and has seen no signs of further intrusions to its internal systems.

Itron did not specify the type of cyberattack it experienced, such as whether ransomware was deployed or if the company had been contacted by the hackers directly.…