New Delhi, September 4Delhi Police Crime Branch along with Anti-Terrorist Squad (ATS) of Gujarat Police today busted an international drugs smuggling racket and arrested an Afghan national with 4 kg heroin worth Rs 20 crore, said a senior official. “We arrested Afghan national Vahidullah, who came to India in 2016 on a medical visa and later got involved in drugs,” Special CP Crime Branch Ravindra Yadav said.