LUCKNOW, Sept. 6 -- The National Investigation Agency (NIA) on Saturday filed a chargesheet against 13 accused in a Pakistan-linked espionage case, alleging that they were part of a criminal conspiracy to access sensitive installations, install spy cameras and transmit geo-tagged photographs and videos to entities based in an enemy country, senior officials said. The chargesheet was filed before the special NIA court in Lucknow. The case was earlier investigated by the Ghaziabad police and involves an alleged Pakistan-linked espionage network operating across the National Capital Region (NCR). According to NIA, the accused conspired to commit offences prejudicial to India's sovereignty, unity and integrity. The agency said its investigation found that the accused illegally trespassed into, approached and accessed prohibited and sensitive areas of importance and collected visual intelligence from these locations. The accused allegedly installed spy cameras and transmitted sensitive information, including geo-tagged photographs and videos, to entities based in an enemy country. The chargesheetnamed Praveen, Raj Valmiki, Shiva Valmiki, Ritik Gangwar, Sameer alias Shooter, Durgesh Nishad, Naushad, Gagan Kumar, Vivek, Shivraj, Meera Thakur, Shane Iram and Mahak. NIA also alleged that members of the network helped entities linked to the enemy state in procuring and using Indian SIM cards for unlawful activities. They allegedly assisted in obtaining photographs and videos of sensitive installations along with their precise GPS coordinates. NIA said the Ghaziabad police have arrested 21 accused, and a probe is on....