NEW YORK (Standard&Poor's) Aug. 8, 2008--Standard&Poor's Ratings Services today lowered its rating on the class II-A mortgage-backed notes from structure group II of American Home Mortgage Investment Trust's series 2007-2 to 'D' from 'CCC'. At the same time, we lowered our rating on the class III-M-1 mortgage-backed pass-through certificates from structure group III of American Home Mortgage Assets Trust's series 2007-3 to 'D' from 'CC' (see list). The downgrades reflect the erosion of credit support for the two classes, as of the July 25, 2008, distribution date, which we believe is attributable to the significant monthly net losses being experienced by the underlying collateral. During the July 2008 distribution period, structure group II from the 2007-2
