WASHINGTON (AP) — Two US officials say the drone strike in Yemen that killed Anward al-Awlaki appears to have also killed al-Qaida’s top Saudi bomb-maker.

Officials say intelligence indicates Ibrahim al-Asiri also died in the attack. The officials spoke on condition of anonymity because the death has not been officially confirmed.

Al-Asiri is the bomb-maker believed to have made the explosives used in the foiled Christmas Day airline attack in 2009 and last year’s attempted cargo plane bombing.

Al-Asiri’s death would make the attack perhaps the most successful single drone strike ever.

Associated Press