(Lincoln, NE) -- New court documents reveal information about a Lincoln child sexual assault case. Forty-year-old Maurice Thomas is accused of sexually assaulting three underage girls about a year ago. He was arrested earlier this month and charged with two counts of 1st-degree child sexual assault and one count of 3rd-degree child sexual assault. Investigators say one of the girls told them Williams threatened to shoot her if she told him no. A 19-year-old woman, Sahara Williams, is also believed to have been involved in the assaults and is facing one count of 1st and 3rd-degree child sexual assault. Both she and Thomas are being held without bond.