NEW DELHI: CPM workers on Wednesday attacked a vehicle of Enforcement Directorate (ED) officials during protests outside the residence of former Kerala chief minister Pinarayi Vijayan in Thiruvananthapuram.The workers are protesting against the central agency over its searches at 10 premises in Keralam, including the residences of Pinarayi Vijayan, in the Cochin Minerals and Rutile Limited (CMRL) case, news agency ANI reported.