The families of missing girls Holly Wells and Jessica Chapman have retraced the 10-year-olds' last-known movements.
Members of both families, including Holly's mother Nicola, walked the routes with police in a bid to piece together more information about areas the girls knew well and had played in.
Mrs Wells, 35, looked tired and drawn as she walked with family liaison officers through Soham, Cambridgeshire, six days after she last saw Holly.
Just hours earlier she learned that two men had been arrested in connection with the disappearance of her daughter, after refusing to co-operate with officers hunting for the girls.
Police have played down the arrests, saying the men had failed to co-operate with routine parts of the investigation and were held because of the seriousness of the inquiry.
They are focusing on a reconstruction of the girls' route on Sunday night, before their suspected abduction.