A LAKESIDE Swiss city has exploded into violence after the death of a migrant teen - with youths torching buses, lobbing Molotov cocktails and pelting police with stones.

Lausanne has seen a second night of running street battles as 200 rioters clashed with 140 officers.

Fireworks, firebombs and burning barricades turned central streets into a warzone, with a bus left gutted and bins set alight.

Police fought back with water cannons, tear gas and rubber bullets.

Seven arrests were made before calm was restored after midnight, Bild reported.

Lausanne authorities moved swiftly on Tuesday to try to head off a third night of violence, deploying extra resources and appealing for calm.

The trigger was the fatal crash of 17-year-old Marvin M., of Algerian descent, who died while fleeing

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