During his last months holed up in a villa in Pakistan, one of the concerns on Osama bin Laden's mind was image control: Al-Qaida's branches and allies were making the terror network look bad in the eyes of the Islamic world.

A newly released selection of letters captured in the US raid that killed bin Laden a year ago shows that the al-Qaida leader was meticulous in tracking how his associates' actions and public statements reflected on the cause of jihad, or holy war. And he frequently tried to keep them in line.

In an October 2010 letter to a top lieutenant, bin Laden complains about Faisal Shahzad, the militant recruited by the Pakistani Taliban to set off a car bomb in New York's Times Square. The May 2010 bombing failed.

During his trial, Shahzad, a Pakistani who gained US citizenship, told the court he "didn't mean it" when he took his American citizenship oath, which includes a vow not to harm the United States.

Bin Laden said lying about an oath breaks Islamic law.

"This is not the kind of lying to the enemy that is permitted. It is treachery," bin Laden wrote. He told his lieutenant to take it up with Hakimullah Mehsud, the leader of the Pakistani Taliban, and ensure it didn't happen again.

"You know the negative effects this has if this matter is not resolved and if the mujahedeen are not cleared of the suspicion of breaking an oath and treachery."

The letters point to the complicated relationship between bin Laden's "al-Qaida Central" and its branches and allies. The Pakistani Taliban are close to al-Qaida and the branches in Yemen, Iraq and North Africa use the al-Qaida name. But they largely operate independently of the top leadership in Pakistan and Afghanistan, which does not appear to know about most operations beforehand and offers advice and guidance, which is not always heeded.

The 17 letters released on Thursday by US officials do not give a full picture of al-Qaida's operation or of bin Laden. The messages, written by bin Laden and senior associates, are only a small sampling of the trove seized in the raid on the compound in Abbottabad, Pakistan, last year.

In his audiotapes to the world over the years, bin Laden was known for his florid rhetoric and highly elevated vocabulary, obscure even to some Arabic speakers.

But there is almost none of that in the private messages to associates. Bin Laden is businesslike and to the point, whether it's discussing travel arrangements for his sons, advising Algerian militants to plant tamarind and acacia trees in their desert hideouts (they're cheap, don't need much water, and can hide you from drones), or telling his lieutenants to try to shoot down President Barack Obama's plane on a visit to Afghanistan.

He is also unflaggingly polite, even in firm criticism of his "brothers" - consistent with the soft-spoken, soothing personality many militants who met him described. He repeatedly prefaces orders with the phrase, "It would be good if ..."

Bin Laden appears intent on imposing greater control over the al-Qaida "franchises", though it is not clear he was ever able to do so.

He raises alarm that attacks by the branches killing Muslim civilians have "cost the mujahedeen no small amount of sympathy among Muslims. The enemy has exploited the mistakes of the mujahedeen to mar their image among the masses," according to the Arabic originals of the letters posted by West Point's Combatting Terrorism Center.

Once again, he turns to Islamic law, pointing to "tatarrus" - literally "shielding" - a set of Shariah rules on when civilian casualties are acceptable during jihad. The branches are playing too loosely with the rules, he says: They expand what should be an exception allowed "only in extreme necessity" and set off bombs without regard to whether Muslim bystanders are likely to die.

"First of all, we will be held responsible for this before God Almighty. And in practical terms, it causes great damage to the message of jihad," he writes in a May 2010 letter to the same lieutenant, Atiyah Abd al-Rahman, who was himself killed in an August airstrike in the Waziristan region of Pakistan.

The Associated Press