I note that two plane spotters have been released in India.
This happened in Greece a few years back, I am always slightly puzzled as to why they are shocked that the police/military are just a bit suspicious.
The world is an odd place and things that are normal here aren't going to be normal in a Foreign Country and vice versa.
They had sparked suspicion after asking a Delhi hotel for a room overlooking Indira Gandhi International Airport. Common sense chaps Common sense!!