Delhi Police today arrested three people for shooting dead two sisters early Sunday morning over a loan of Rs 10,000. Police said 15 to 20 armed men reached RK Puram's Ambedkar Basti in Southwest Delhi around 4 am, knocked at a door and threw bricks at it. They left when nobody opened the door, even after continuous stone-pelting. The homeowner Lalit, who the assailants were looking for, then stepped out of the house along with his two sisters, and was enquiring about the attackers when they suddenly returned and opened fire.