The city of Little Rock's email and network applications remained down on Wednesday, Mayor Frank Scott Jr. said in a tweet.
Scott said the city's network and email had been taken down "as a precaution due to a security concern."
Little Rock's phone system as well as 311 and 911 service remain operational, according to a statement issued by the city, which encouraged residents to reach city departments by calling 501-371-4510.
The outage was first disclosed by the city on Tuesday.