The Delhi police has arrested a Group Captain of the Air Force on charges of spying. The officer Arun Marwaha was arrested on Thursday on charges of passing on information and secret IAF documents to the ISI. The officer was allegedly using his smartphone to click pictures of classified documents, the police said. The arrest has been confirmed by DCP Special Cell Pramod Khushwaha. He allegedly clicked pictures of classified documents relating to combat exercises of the IAF and later passed them on through WhatsApp, the probe revealed.