The leader of al-Qaeda's Yemeni offshoot has warned the U.S. that Osama bin Laden's death does not signal the end of the fight and threatened to carry out worse attacks in the future.

Nasser al-Wahishi, the head of al-Qaeda in the Arabian Peninsula and once a close associate of bin Laden, posted a eulogy for the slain al-Qaeda leader on Islamic extremist websites Tuesday.

Al-Wahishi warned Americans "the matter will not be over" with bin Laden's death and that "what is coming is greater and worse."  

He said "jihad is glowing brighter" now than during bin Laden's life, according to a transcript provided Wednesday by SITE Intel group, which monitors militant messages.

Al-Qaeda in the Arabian Peninsula is one of the most active affiliates of the terrorist network. The Canadian government added the Yemen-based al-Qaeda offshoot to its list of banned terrorist groups last December.