New Delhi, Aug 1 (IANS) The Enforcement Directorate on Thursday searched the residences of former promoters of Ranbaxy, Malvinder Mohan Singh and his brother Shivender Mohan Singh, officials said.A senior ED officer said the searches were conducted in Delhi on charges of money laundering.The raids took place after a case was filed against the brothers under the Prevention of Money Laundering Act (PMLA). --IANS aks/mr