Paul Moss

Scores of people gathered in Milan on Saturday afternoon.

Basically, they were all a part of this big group called Unsustainable Olympics Committee.

This was an activist organisation.

They had mobilised students, housing activists, many sports groups, all from the northern part of Italy, and they were against protest.

what they call the environmental impact of these Olympic venues.

When you build such a huge venue, it is causing damage to the surroundings.

When they reached the Olympic Village, violent activities were happening.

They were throwing fireworks and then police used water cannon as well as tear gas to disperse the group.

And then only one group was firing these fireworks as well as attacking police vans.

The other group, they were protesting peacefully and they wanted to highlight how unsustainable these games could be.

Saturday also saw a suggestion that the railways in Italy have been sabotaged in several places.

Do we know if there's any connection with the protests you're talking about?

The authorities are talking about three incidents.

One was about a box containing a switch was set on fire.

This is near the city of Passero.

And the second one was where they saw severed cables near the city of Bologna and a very rudimentary explosive device in another location.

So that actually caused more than two and a half hours of delay in these high-speed trains.

They were suspended for a while.

But later on Saturday afternoon, they started resuming the service.

But the ministers are taking this very seriously.