<h1>Suspect detained; probe traces exploded-site vehicle ownership, dealers ordered to produce sale records and buyer IDs</h1> A suspect linked to a vehicle used in an explosion near a historic site has been detained and is being questioned as investigators trace the vehicle's chain of ownership; authorities are reviewing dealership records, transaction logs and CCTV to identify intermediaries and possible use of fake identities or cash transactions circumventing verification. Police have ordered coordinated verification by district commanders and local station officers across the capital and adjoining states, requiring second-hand dealers to produce sale-purchase records and buyer identification and to report suspicious transactions. Parallel checks by neighboring state police and further questioning of persons in the transaction chain are anticipated as the probe expands.