It added it first received the reports at about 5:05 p.m. Tuesday.
"As a precautionary measure, we have stopped departures while we investigate", it said. "We apologize to passengers for any inconvenience this may cause".
She explained: "Heathrow's aim is to design a sustainable, fair and more efficient future airport while connecting the United Kingdom to global growth".
A spokesperson from the airport confirmed that a drone was sighted near or within the airport, prompting the precautionary suspension of departure flights.
Sussex Police Chief Giles York, who is working on the Gatwick investigation, told BBC radio in late December that police have searched 26 potential launch sites near the airport but do not believe they have found the drone that was seen near the runway on Dec. 19 and Dec. 20.
Another said: "Stuck onboard a plane in runway at #Heathrow".
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Transport Minster Chris Grayling said the military are "preparing to deploy equipment used at Gatwick should it prove necessary".
Flights were stopped for approximately one hour, sparking a number of delays at the busy airport.
Whoever had their fun with a drone at Gatwick is about to hand loads more anti-drone powers to the police, as the Home Office has announced the results of a consultation into What To Do About Drones.
Heathrow and Gatwick recently also spent millions of pounds on military-grade anti-drone equipment. No arrivals, no departures due to Drone activity in the area'.
Locals now get half a day's respite from noise when take-offs and landings switch to the opposite runway at 3pm, but Hacan claims this would be reduced to one third of a day.
Police will also be allowed to fine users up to £100 (112 euros, $128) for failing to comply when instructed to land a drone, or not showing registration to operate a drone.