"Security has been beefed up at crowded and important places like railway stations, bus stations, markets," Delhi Police spokesperson Rajan Bhagat said.
He, however, clarified that it is not a situation of red alert.
"A red alert is sounded in case there is any specific intelligence input which is not the case here. Additional security measures have been taken only as a precautionary step," he said.
A 24-year old woman techie was killed and 14 others were injured, two of them critically, when two low-intensity bombs exploded in a span of ten minutes in two coaches of the Bangalore-Guwhati Express at the busy Central Railway station in Chennai early this morning.