Bush calls bin laden death 'momentous achievement'

Former President George W. Bush, who was in office at the time of the September 11 attacks and famously said he wanted Osama bin Laden dead or alive, on Sunday called the death of the al Qaeda leader a "momentous achievement."

Bin Laden dies, but the terror threat lives on

Osama bin Laden's death may temporarily decapitate al-Qaida, but the threat of terror attacks remains, and it could spike in coming days from individuals or small extremist groups inspired to take revenge for the killing, terror experts said Monday.

US House votes to renew anti-terrorism provisions

US anti-terror outpost tackles rat-borne virus

In a far-flung laboratory in West Africa, American researcher Matt Boisen drops serum from a woman infected with Lassa fever onto a slim strip, testing a new way of diagnosing the deadly virus.