The U.S. Justice Department announced two significant actions this week, involving both cybersecurity enforcement and corporate merger approval.

In cybersecurity enforcement, the department seized four internet domains connected to Iran. One of the domains was reportedly used by a hacker group that had claimed responsibility for a cyberattack targeting a U.S. medical technology company. The seizure represents part of ongoing U.S. efforts to combat cyber threats originating from Iran.

Separately, the Justice Department cleared Nexstar Media Group's proposed $3.5 billion acquisition of Tegna Inc. The approval removes a major regulatory hurdle for the television station deal, which would significantly expand Nexstar's broadcast footprint across the United States.

The domain seizures highlight continued tensions between the U.S. and Iran over cyber activities, particularly those targeting American companies and critical infrastructure. Medical technology companies have become increasingly frequent targets of cyberattacks due to the sensitive nature of their data and systems.

The Nexstar-Tegna deal approval comes after regulatory review of the merger's potential impact on local television markets and media competition. The acquisition would make Nexstar one of the largest television station operators in the country.