'Trident' Vulnerabilities Prompt Apple iPhone Update

A pair of U.S. cybersecurity firms have announced the discovery of three vulnerabilities in the Apple iPhone operating system, a spokeswoman for Lookout, a mobile cybersecurity firm, said today.

Lookout said that it and another firm, Citizen Lab, discovered the trio of vulnerabilities, and are calling them "Trident."

The companies have notified Apple of the vulnerabilities, the Lookout spokeswoman said.

Apple released a software update for affected devices Thursday afternoon. The Lookout spokeswoman said the update was related to the vulnerabilities.

Apple did not immediately respond to calls and emails from ABC News seeking comment.

A page detailing the update on the Apple website reads: "For our customers' protection, Apple doesn't disclose, discuss, or confirm security issues until an investigation has occurred and patches or releases are available."

This is a developing story. Please check back for updates.