A red alert has been sounded in the national capital after two unidentified men opened fire at foreign tourists outside the historic Jama Masjid on Sunday. Police has erected barricades on stretches across the capital and conducting checks. Parking of vehicles outside Commonwealth Games venues and iconic buildings have been banned in the wake of firing. The firing incident in which two Taiwanese nationals were injured was followed by an explosion inside a car in the same area. Delhi police last night said that investigators have not found any explosives in the car. Police have detained one person for questioning in connection with the case. The two injured – Cesewein (27) and Cinglo (28) have been admitted to Lok Nayak Jaiprakash Narayan Hospital. Delhi Chief Minister Sheila Dikshit said the incident is sad and worrying but said there was nothing to panic. Union Home Ministry says it is closely monitoring the investigations into the incident and has sought a report from the Delhi Police. Home Minister P Chidambaram also visited the LNJP Hospital and enquired about the health conditions of the injured. United States has issued a travel advisory to its citizens asking them to be cautious and maintain a low profile.