The Red Fort station is part of the Delhi Metro’s Violet Line, which operates between Kashmere Gate and Ballabhgarh, and is a key route for commuters travelling through Old Delhi

Preparations are in full swing for the second and final phase of the Bihar Assembly elections, where 3.7 crore voters will decide the fate of 1,302 candidates across 122 constituencies today.

The suspected suicide bomber was either waiting for someone or awaiting instructions in the parking lot, sources said.