Three unidentified persons robbed Rs 50 lakh from a cotton merchant Ishaq at Ganesh Gadda near Sangareddy on Monday night. When the incident took place Ishaq was proceeding to Sangareddy from Hyderabad. Unidentified miscreants stopped the car and threw chilli powder on the victim. Before he could recover from sudden attack, they fled with the money. Medak SP Sumathi visited the crime spot.