The Enforcement Directorate (ED) has written to about 100 cooperative bank branches across the country seeking details about activities in their dormant accounts and other suspicious transactions as part of its anti-black money probe after demonstration.ED officials said in New Delhi that the details has been sought from these banks after it got reports about suspicious activities of some huge transactions being reported from the bank accounts in these branches. They said the Enforcement Directorate is probing these cases for possible contravention of the Foreign Exchange Management Act (FEMA) and the Prevention of Money Laundering Act (PMLA).