Hackers broke into the computer networks of major critical infrastructure equipment vendor Itron, the company said in a statement late Friday.

Itron, which makes devices that analyze energy and water use, “took action to remediate and remove the unauthorized activity” after discovering the intrusion on April 13, according to a Securities and Exchange Commission filing.

The company said it “has not observed any subsequent unauthorized activity within its corporate systems” and added that it didn’t detect any unauthorized access to customer data.

Liberty Lake, Wash.-based Itron’s smart-meter devices are ubiquitous in the electric, gas and water sectors, and it has partnered with local governments on smart-cities projects in which its products control other energy infrastructure. It claims to have contracts with more than 7,700 utility providers in 100 countries. It is also working with Cisco to provide better internet connectivity to smart devices.

The company declined to comment on how it learned of the attack and which of its systems were compromised.

In its SEC filing, Itron said that the cyberattack did not disrupt its operations and that it expects its insurance policy to cover “a significant portion of its direct costs incurred relating to the incident.”

Itron “does not currently believe the incident has had or is reasonably likely to have a material impact on the company,” the filing said.