Witch doctors and security forces in Gambia have detained up to 1,000 people on suspicion of being witches, Amnesty International said Wednesday. The Gambian police dismissed the reports as lies. Victims have been held in secret detention camps for up to five days and forced to drink hallucinogenic substances, which have killed at least two people, Amnesty International said in a statement. Quoting an unidentified Gambian described as a witness, the group said that armed paramilitary police officers had surrounded a village and threatened its residents with death if they tried to escape. Then, the person said, hundreds of men and women were forced onto buses at gunpoint and taken to the home area of the president, Yahya Jammeh, where they were stripped and had to drink and bathe in a potion made from toxic herbs.