US President Barack Obama on Friday praised the CIA spies who helped track down Osama bin Laden, and warned the al Qaeda members that they must keep an eye on their backs as the US gets key information related to terrorists held during the raid in Osama's compound in Abbottabad.

Every terrorist in the al Qaeda network should be watching their back, because we're going to review every video, we are going to examine every photo, we're going to read every one of those millions of pages, we're going to pursue every lead. We are going to go wherever it takes us, IBN Live quoted Obama as saying.

We walked off with his files... the largest treasure trove of intelligence ever seized from a terrorist leader. Many of you now are working around the clock; you didn't have much time to celebrate, Obama told CIA chiefs at their HQ in Langley Virginia.

Obama said he was briefed about Laden's location last summer. Since then, CIA had formed a strong intelligence network to trace the most wanted terrorist. He appreciated the agency's effort to find Osama bin Laden and finally hunt him down.