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Weijia, what can you tell us? >> reporter: well, we know that the white house says the u.s. is sending senior f.b.i. and homeland security officials to port-au-prince right away to help with the investigation. the haitian government also has requested u.s. troops be deployed to help stabilize the country, but tonight a senior administration official tells cbs news there are no plans to provide military assistance at this time. major. >> garrett: weijia jiang at the white house, thank you. tonight the f.d.a. is calling for an investigation into its approval of a new drug for alzheimer's patient...

Will carr, thank you. we're going to move on tonight and to what could be a major medical breakthrough. the fda approving the first new treatment for alzheimer's in almost 20 years and the first drug the company says to reduce the plaque in the brain and not just treat the symptoms of the disease. but the fda's own advisory board had voted against this. the fda moving forward, siding with families and their doctors who are desperate for help. abc's stephanie ramos tonight on the new hope and the concerns. even the fda saying more study is needed. >> reporter: tonight, the first new drug appr...