Ukraine intelligence announced on Monday that they had thwarted a planned attack on Euro 2016, arresting a Frenchman trying to return to the European Union after stockpiling weapons in the country.

Ukrainian intelligence has announced that they have thwarted a planned attack on Euro 2016, arresting a Frenchman trying to return to the European Union after stockpiling weapons in the country.

The Ukrainian Security Service, or SBU, said it had followed the man since December and allowed him to purchase five machine guns, two rocket-propelled grenade launchers and 125 kilograms (275 pounds) of TNT.

He also bought 20 balaclavas before he was arrested at the border crossing between Ukraine and Poland last month.

The SBU chief Vasyl Hrytsak said 'they've managed to foil a series of 15 terrorist attacks which were planned to target France before and during' Euro 2016.

The SBU did not identify the man but said the suspect wanted to protest against his government's migration policies and the spread of Islam. They said he planned attacks on bridges, railways and other infrastructure connected to the tournament..

The Paris police prefect, Michel Cadot, declined to comment on the information from Ukraine, saying only that "there is no specific threat against any (Euro 2016) site."

Ukraine's intelligence agency had initially planned to keep a lid on the investigation, but decided to go public about the arrest after reports in international media, Hrytsak told national television.

French regional newspaper L'Est republicain identified the man as Gregoire Moutaux and said investigators raided his home in Nant-le-Petit near the eastern city of Nancy in late May. The source for the man's identity wasn't cited.