Lucknow A sub inspector was shot at when he challenged two men outside a jewellery shop here early Monday, police said. The bullet hit Rajendra Dwivedi, 50, in his waist. He was taken to the trauma center where his condition is stated to be critical. He told officials that two motorbike-borne miscreants shot at him in TP Nagar area. Station House Officer (SHO) Sarojininagar Sudheer Kumar told IANS that sub inspector Dwivedi was on patrol duty when he spotted two people outside a jewellery shop. He caught hold of one of them. But they escaped after shooting him. The police official also fired but the men had fled by then.