ISIS propaganda poster depicts drone delivering package over NYC

ISIS has circulated a threatening propaganda poster depicting a mocked-up photo of a drone delivering a package and hovering over New York City, the Daily Mail reported.

The drone in the photo is transporting a box with the words "Private Mailbox" written on it. And above the Manhattan skyline are the words, "Sender: The Islamic State."

Multiple smaller photos featuring previous attacks claimed by the terrorist group are lined across the bottom of the poster.

The poster comes as drone chaos at London's Gatwick Airport has forced one of the United Kingdom's busiest airports to halt flights for the second time since Wednesday.

What happened at Gatwick?

On Wednesday night, authorities shut down all flights at about 9 p.m. after drones were spotted buzzing the airspace over the airport, according to reports.

The next day, the British Army was deployed to knock the drones out of the sky.

The military is believed to have used special equipment called a "kill-jammer" to cut-off the drone's communications from up to two miles away. Then the drones were shot down by a laser, the Mail reported.

By 10 p.m. Thursday, drone sightings had stopped.

Flights resumed Friday morning at 6:30, but just hours later, BBC News reported that operations were again halted after another sighting occurred.

Has anyone been caught?

Authorities haven't located those responsible for the drone event, and the motive for the more than 50 flyovers is still unclear.

Investigators are working to determine whether or not the drones may have been flown by a "lone wolf eco-warrior" who wanted to ground the airliners for environmental reasons.

British Transport Secretary Chris Grayling said the possibility of the drone attack being led by a hostile foreign country has not been ruled out.