From The Washington Post article:

A European intelligence official said the British government was examining the video, and the speech of the purported executioner, to compare it with former Guantanamo Bay prisoners and other British residents believed to have joined the Islamic State.

In the video the terrorist who killed Foley spoke in what sounded like a British accent.

Sadly that’s probably true. Outrage now occurs along party lines and the party that owns the media wouldn’t be outraged by this.