Secret Service says agent saw 'quad copter' fly into White House complex
"There was an immediate alert and lockdown of the complex until the device was examined and cleared," a Secret Service spokeswoman said in a statement, noting the incident happened at 3:08 a.m. ET (0808 GMT).
"An investigation is underway to determine the origin of this commercially available device, motive, and to identify suspects," she said.
(Reporting by Roberta Rampton; Editing by Susan Heavey)