A combined team of Imphal West District Police and 12 Bihar Regiment today conducted combing operation at Kwakeithel area.Police source said that the personnel of Imphal West District Police and 12 Bihar Regiment cordoned Kwakeithel Thounaojam Leikai, Akham Leikai and Heinoukhongnembi area at around 5 am this morning.The combined team picked up four persons for further verification in the combing operation.