The Enforcement Directorate on Thursday summoned actor Prakash Raj for questioning in connection with a money laundering case linked, official sources said Thursday.The case pertains to an alleged Rs 100 crore ponzi and fraud scheme by a Tiruchirapalli-based jewellery group.According to a PTI report, ED conducted raids against Pranav Jewellers, a partnership firm based in Tiruchirapalli, and seized "unexplained" cash of Rs 23.70 lakh and some gold jewellery.