A probe has been launched after a drone was spotted over Prime Minister Narendra Modi's residence in Delhi early this morning, officials have said. The Prime Minister's official residence comes under the no-fly zone. The drone was reportedly seen over the PM residence at around 5 am. After being alerted by the Special Protection Group (SPG) officers, the Delhi Police launched a search operation to track the flying object. The SPG is responsible for providing security to the Prime Minister. Police and other security agencies have, however, not found anything suspicious so far. "Thorough searches were made in nearby areas, but no such object was detected. Air traffic control room (ATC) was also contacted, they also did not detect any such flying object near PM residence," Delhi Police said in a statement.