NEW DELHI: THe Enforcement Directorate (ED) is probing the roles of Amol Awasthi and Anupam Awasthi, both NRI sons of US Awasthi, MD and CEO IFFCO, and Vivek Gahlaut -- also an NRI, and son of Parvinder Singh Gahlaut, MD of the Indian Potash Limited (IPL), in connection with its money laundering probe into the fertilizer scam.