Delhi Police today stepped up security in the national capital with several countries including the United States issuing alerts about imminent terror strikes in the city. More policemen have been deployed on the streets and security enhanced in crowded places like shopping malls, cinema halls, markets and transport infrastructure.<br/> <br/>Talking to AIR, spokesperson of Delhi Police, Rajan Bhagat said that the police is aware of the advisory and appropriate measures are being taken. He appealed to the public to be vigilant and to inform the nearest police station in case they notice any suspicious object, person or vehicle. He said the name of the informant will be kept secret. <br/><br/>Earlier today, US, UK and Australia had warned of imminent terror threat in the Capital, particularly in market places like Connaught Place, Greater Kailash and Chandni Chowk.