Ransomware has been one of the top cyber threats in the past several years. In December 2018, Delaware Guidance Services, a Wilmington-based mental health provider, was hit by a ransomware attack that impacted sensitive medical and financial information of about 20,000 children. Ransomware has also hit major cities, including Baltimore and Atlanta. The attack on Baltimore, which began on May 7, 2019, crippled city services and is expected to cost the city over $18 million. As of July, all services have not yet been restored and the effects will linger for months.