US Defense Secretary Pete Hegseth and other officials accidentally leaked sensitive information about a Yemen attack via the messaging app Signal. This incident raised concerns about security breaches and the appropriateness of using consumer messaging apps for classified discussions. Experts highlighted the risks associated with human error and device security, emphasizing that even secure platforms like Signal can be compromised. The Pentagon warned of Russian hacking targeting Signal, and experts suggested that government officials should use specialized systems for handling classified information instead.