nairobi u.s. embassy eritrea say receive report gunfire several part capital asmara protest erupt one africa secretive nations embassy advise u.s. citizens avoid downtown area protest appear prevalent say statement late tuesday avoid areas demonstrations take place exercise caution vicinity large gather protest demonstrations immediately clear cause protest opposition outlets say incidents trigger government try close islamic school predominantly muslim district footage post online shots hear fire disperse crowd via twitter information minister yemane ghebremeskel downplay protest say small demonstration one school asmara disperse without casualty eritrea sit red sea coast next one world busy ship lanes secede ethiopia 1991 three-decade war independence conflict break seven years late border spat neighbor ethiopia un since accuse government asmara commit crimes humanity guise national security u.n. commission inquiry report last year say atrocities include indefinite military national service program amount mass enslavement commit since country independence ongoing eritrea deny charge gunfire hear eritrea 's capital protest break u.s. embassy say