WASHINGTON (Reuters) -The governor of the U.S. state of Nevada says that offices have closed, websites are offline and phone lines are patchy following an unspecified "network security incident."

Nevada closed all in-person services at state offices on Monday following the "network security incident," which was first detected early Sunday, according to a press statement from Gov. Joe Lombardo. While the in-person services were unavailable because of the outage, emergency services and 911 remained online.

Nevada state government agencies are experiencing a “network security incident,” the office of Governor Joe Lombardo said Monday, prompting the closure of offices.