Google’s threat analysis group, which counters targeted and government-backed hacking against the company and its users, sent account holders almost 40,000 warnings in 2019, with government officials, journalists, dissidents, and geopolitical rivals being the most targeted, team members said on Thursday.

The number of warnings declined almost 25 percent from 2018, in part because of new protections designed to curb cyberattacks on Google properties. Attackers have responded by reducing the frequency of their hack attempts and being more deliberate. The group saw an increase in phishing attacks that impersonated news outlets and journalists. In many of these cases, attackers sought to spread disinformation by attempting to seed false stories with other reporters. Other times, attackers sent several benign messages in hopes of building a rapport with a journalist or foreign policy expert. The attackers, who most frequently came from Iran and North Korea, would later follow up with an email that included a malicious attachment.