Ukraine's security chief says they've foiled 15 planned terrorist attacks on the Euros this summer.

A French national has been arrested in the country and he's accused of making contact with illegal Ukrainian groups to buy guns and explosives.

Meanwhile, authorities in France say they're doing all they can to ensure there are no terrorist attacks during the tournament.

The competition gets underway this week and President Francois Hollande has admitted that an attack is a possibility.

Correspondent with CBS Elaine Cobbe is based in Paris: