Four people have been detained in connection with the blast at Agra hospital yesterday. They, along with the hospital staff, are being questioned. The explosion at Jai Hospital left four people injured; no casualty was reported. The explosion which occurred at 5:45 pm broke the windowpanes in the reception area where 10 to 15 people were seated in steel chairs. Several patients were evacuated from the hospital and police cordoned off the entire area and conducted a combing operation.