Following intelligence agencies' inputs about infiltration of 10 suspected terrorists into Gujarat, Delhi was also put on high alert on Sunday as a precautionary measure, police officials said.
"Delhi has always been on high alert. But the recent intelligence alert about the entry of some suspected terrorists in Gujarat is really a serious issue following which a prompt message was circulated to step up security, " said a police officer on condition of anonymity.
The officer said that all the station house officers (SHOs) of over 180 police stations in Delhi have been asked to enhance security at busy markets, vulnerable places and vital installations falling in their jurisdiction.
Security has also been tightened at railway stations, Inter State Bus Depots (ISBTs), borders and airport, the officer added.
Delhi along with all metro cities was reportedly put on high alert just hours after intelligence inputs about the infiltration of 10 suspected terrorists into Gujarat to carry out attacks against high - value targets.
Minutes after the alert, security across Gujarat was intensified and leaves of all police personnel were cancelled.
Two NSG teams, comprising nearly 200 personnel, were sent to Ahmedabad by the central government on the request of the Gujarat government.
The agencies suspect that the infiltrators belong to Pakistan as a fishing boat of the neighbouring country was seized by an Indian Border Security Force patrol team on Friday. Its occupants fled upon seeing them in the Koteshwar creek area off the Kutch coast along the India - Pakistan border in Gujarat.