The company, which distributes medicines and medical devices to hospitals and healthcare practices across the U.S., said it was hacked and expects intermittent service degradation.

The ATF is the latest federal government agency in recent years to notify Congress of a "major incident" involving its cybersecurity.

The private equity giant confirms a breach, weeks after Google researchers said hackers were targeting financial companies.

A hacker pretending to work for a leading cryptocurrency news website targeted several cybersecurity professionals using Google Docs as a way to deliver malware.

The data search and AI giant confirmed unauthorized access to its systems during an incident on Tuesday, and said it was investigating the breach.