NEW : Activist group says at least 187 dead on Thursday . The death total in Syria includes at least 12 children , House says . Activist reports clashes between military defectors and security . An activist from the Coalition of Free Damascenes for Peaceful Change said security forces fired on demonstrators , and that army defectors , including members of the Free Syrian Army , clashed with security . Syria administration officials testify before a House panel .
NEW : Activist group says at least 187 dead on Thursday . The death total in Syria includes at least 12 children , House says . Activist reports clashes between military defectors and security . Syria administration officials testify before a House panel .