NEW DELHI, India — A drone landed inside the White House grounds early Monday, a federal law enforcement official told NBC News. The official gave no further details about the unmanned aerial vehicle, other than to say it landed in a tree at 3 a.m. ET. The Secret Service responded and determined the drone did not pose a threat, the official said. Earlier, President Barack Obama’s Press Secretary Josh Earnest told a briefing on Obama’s trip to India that a “device” was found within the White House grounds.