An argument between neighbours went out of control when one side opened fire on the other, killing a woman and leaving three others injured — one of them critically. Four persons who allegedly opened fire have been detained and are being interrogated Rambati (51) died on spot while three others of her family Meena (35), Billu (42) and Satish (38) have been injured. The incident was reported from Badli in Outer Delhi at 8 pm. "One of the suspects started hurling abuses at his neighbours and his acquaintances over some petty issue. When the other party objected to this, the accused got infuriated and opened fire. Four persons were injured and rushed to Babu Jagjivan Ram Memorial hospital. One of them succumbed and another is critical. The four persons who had fired have been detained. We are now questioning them regarding the motive behind the incident," DCP (Outer), BS Jaiswal told Newsline. A case of murder and attempt to murder has been registered at Badli police station.