Another update to this story.  By Ahmed Al-Haj for AP:

SAN'A, Yemen (AP) — An American al-Qaida suspect detained in Yemen fooled his hospital guards into unshackling him by asking to join them for prayers, security officials said Saturday. He then killed a guard who laid down his weapon as he went ahead at prayer time.

The new details of Sharif Mobley's failed escape attempt, obtained by The Associated Press, indicate the 26-year-old American of Somali descent has a level of training and cunning characteristic of the terror network.

Some might justifiably interpret "the terror network" as a reference to Islam itself.

[...]

At the hospital, Mobley befriended his guards and asked them to teach him Arabic. He performed prayers and read the Quran with them.

Then a week ago, the officials said, Mobley asked his guard to unshackle him from his hospital bed at prayer time. The guard did and then went into a washroom ahead of Mobley to perform ritual ablutions required before the five daily prayers in Islam, leaving his gun unattended.

Mobley snatched the gun and shot the guard twice — first in the head, then in the chest — as he walked out of the washroom.

When a second guard outside heard the shots, he rushed in. Mobley shot him in the kidney and abdomen, leaving him in serious condition. Mobley was then chased around the hospital until he surrendered.

It should have been forbidden for a Muslim to kill another Muslim, according to the Qur'an.  Maybe the guard was a Shi'ite, or maybe he didn't pray often enough, or maybe he listened to music.  But whatever it was, I'm sure there was an excuse.  There is always an excuse for a devout Muslim to justify murder.  Always.