At least three militants were detained and 21 others laid down their weapons in last 24 hours of ongoing surveillance operation in Swat and other parts of Malakand division, report said. Qari M Amin - a major accused of assassination of a local spiritual figure, among two militants were detained in Kantai area of Swat. A would-be suicide bomber, identified as Ahsan, was detained in Kanju by the forces, a handout issued by the ISPR said here Wednesday. Meanwhile, 21 more militants have laid down their arms and surrendered before the authorities in last 24 hours. Those were included 14 from Barshore and seven from Shah Dherai and Deolai areas each.