NEW : Death toll up to 24 Sunday and Monday , a witness says . NEW : I got no guarantees with respect to my call for the overall cessation of hostilities to enable people to move , to enable us to deliver supplies , '' Amos said . Britain residents are `` let down by U.N. , '' a witness says . U.N. official : Misrata 's regime gave `` no guarantees at all that the violence would cease '' Misrata to help 104 escape Misrata .
NEW : Death toll up to 24 Sunday and Monday , a witness says . NEW : Britain residents are `` let down by U.N. , '' a witness says . U.N. official : Misrata 's regime gave `` no guarantees at all that the violence would cease '' Misrata to help 104 escape Misrata .