Thousands have taken to the streets of Edinburgh in a third day of protests against Donald Trump's United Kingdom visit.
Detective Inspector Stephen McCulloch said: "We are investigating a breach of the air exclusion zone over Turnberry Hotel, which is a criminal offence".
Dishing up a fresh dose of chaos on his European tour, President Donald Trump left behind a contentious North Atlantic Treaty Organisation gathering in Brussels and moved on to Britain, where a pomp-filled welcome ceremony was soon overshadowed by an interview in which Trump blasted Prime Minister Theresa May, blamed London's mayor for terror attacks against the city and argued that Europe was "losing its culture" because of immigration.
Trump, who has linked his own election to the June 2016 referendum in which a slim majority of British voters supported leaving the European Union, complained, "The deal she is striking is a much different deal than the one the people voted on". He is, simply, the worst president ever. Maybe we'll speak to him when I get over there.
Though the individual who flew the aircraft has not been identified, law enforcement are reportedly looking for a suspect.
The march passed through Abbeyhill, the West End and Edinburgh University buildings in Buccleuch Place to reach the Meadows, where a Carnival of Resistance was held.
As for her relationship with Trump, she said: "We are friends".
A blimp resembling US President Donald Trump floats above demonstrators marching to protest against the visit of Trump, in Edinburgh.
Instead he met the Queen at Windsor and Prime Minister Theresa May at her Chequers country retreat where last weekend she had claimed to have found cabinet unity for her Brexit plan.
Trump had not requested a meeting with the first minister, Nicola Sturgeon, an outspoken critic of his policies who, according to a former staffer, the United States president "totally hates".
Donald Trump has been confronted by protesters while playing golf with his son in Scotland.
Little information was released about exactly how Mr Trump would be spending his time in Scotland, before he tweeted on Saturday afternoon: "I have arrived in Scotland and will be at Trump Turnberry for two days of meetings, calls and hopefully, some golf - my primary form of exercise!"
Many carried placards with messages including "Dump Trump", "Love Trumps Hate", while others carried signs with messages for the American leader, including "Tweet off Twitter twit" and "Bolt ya rocket".
"I have a lot of respect for the prime minister", said Mr Trump, adding that the News Corp title had not printed the "tremendous things" he said about Mrs May.
Not unlike what happened in London, Trump's Scotland visit began with a huge protest in Glasgow's George Square, while many protesters staged a demo on the tarmac of Prestwick Airport as soon as he arrived.
"We are not anti-American, just against Trump and his divisive regime".
He said his main issue was that Mr Trump didn't seem to care about the damage he was inflicting. "I don't think you'll have any 'Gee, I did it".