Al Qaeda Letter Details Plans for Mali

Also shows divisions from within over applying Islamic law

The Associated Press has discovered a confidential letter written by a senior al-Qaida commander, spelling out the terror network's strategy for conquering northern Mali.

The nine-page letter, found on the floor of a house occupied by the fighters, is signed by Abdelmalek Droukdel, the leader of al-Qaida in the Islamic Maghreb.