Syria will be one of the main topics at next week's G8 meeting, being held in Northern Ireland.
The town of Enniskillen, with a population of 15,000, will also become the temporary home to nearly 9,000 police officers, to protect leaders of the eight big industrial countries.
ITV News Correspondent Martin Geissler reports on the security operation:
More top news
The Ukip leader confirmed he had "no prior warning" of Douglas Carswell's resignation from the party as he hit out at the "staunch Tory".
Two knives were found at the scene in Islington, North London, and the suspects fled on foot before being arrested.
The violence began after a counter-protester allegedly doused a female rally organiser with pepper spray.