The following is a news story from May $5,2023.$ Choose the security term below that best relates to the story:

DALLAS $($AP$)-$ Dallas was hit with a computer ransomware attack Wednesday that brought down its Police Department and City Hall websites and caused some jury trials to be canceled, officials said.

The outage didn't appear to affect $911$ calls. However, it did cause problems with a computerassisted dispatch system that is used to help firefighters respond to emergency calls, Dallas FireRescue spokesman Jason Evans told the Dallas Morning News.

$"$DFR has been running on manual dispatch operations since early this morning," Evans said.

Ransomware involves hackers essentially holding a target computer or computer system hostage by encrypting its files and demanding payment, often via bitcoin. Ransomware can target individuals, businesses and governments alike.

In a statement, the city said the attack had only a limited impact on delivery of city services.

"The City team, along with its vendors, are actively working to isolate the ransomware to prevent its spread, to remove the ransomware from infected servers, and to restore any services currently impacted," read the statement.

The city didn't indicate whether any financial demands had actually been made or provide other details of the incident.

The Police Department and City Hall websites were down Wednesday aftemoon, officials said,