NEW DELHI: As ecommerce regulations are tightened, fight between foreign companies Amazon, Flipkart and Indian companies Reliance, Tata Group is set to intensify.Foreign brokerage, Jefferies said in a note, "The proposed rules now target indirect ownership in vendors, own label, flash sales. Fight between foreign cos (Amazon, Flipkart) & Indian cos (Reliance, Tata Grp) is set to intensify".