"We received an input that some militant outfits are planning to create terror in the national capital by targeting some prominent locations and based on that we have taken necessary security precautions," Joint Commissioner of Police (Special Cell) Karnal Singh said.

The input was of general nature but police has stepped up security in Delhi so as not to take any chance, Singh said.

Following the intelligence warning, Police Commissioner Y S Dadwal has issued orders for mounting vigil at all major markets and other crowded places, including malls, railway stations, Delhi Metro and bus stands.

Police presence at these places has been increased, a senior police official said, adding patrolling has also been stepped up.

"There is nothing to panic. Personnel have been alerted. We are keeping a close watch," the official said.

Vigil has also been increased on Delhi's entry points, with Delhi Police officials maintaining a close coordination with their counterparts of neighbouring states.

A close watch is also being kept at cyber cafes and their owners have been asked to maintain a list of their customers along with server logs, the official said, adding that dealers providing mobile phone connections have been asked to maintain a list of their customers.