An explosion rocked a private hospital in Agra city of northern Indian state Uttar Pradesh yesterday, leaving six persons injured. The blast took place in the reception of Jai Hospital where explosives were kept under a chair, said Inspector General of Police, Agra Range, P K Tiwari. Replying to a question, he said it was too early to say if it was a terror attack, according to a report of the Press Trust of India.