Defence Minister Rajnath Singh said on Tuesday that India’s leading investigating agencies are conducting a “swift and thorough” inquiry into Monday’s blast near Delhi’s Red Fort, adding that those responsible will not be spared.

At least 13 people died in the blast that took place in a car near the Red Fort Metro Station on Monday evening. There is no official word yet on what caused it.

“I wish to assure my fellow citizens that the country’s leading investigative agencies are conducting a swift and thorough inquiry into the incident. The findings of the investigation will soon be made public,” Singh said at a defence conclave, assuring that those responsible for this tragedy will be brought to justice.

He also extended his condolences to the families of the blast victims. “I pray to God to grant strength and solace to the bereaved families in this hour of deep grief,” he said.

Singh was delivering the inaugural address at the second edition of the Delhi Defence Dialogue on ‘Harnessing New Age Technology for Defence Capability Development’, organised by the Manohar Parrikar Institute for Defence Studies and Analyses (MP-IDSA).