Two vehicles owned by the Circus Knie caught fire in Nyon in the early hours of Sunday morning.
Police say they believe the fire was intentional - but the circus was not the target.
It had been set up on the Place Perdtemps.
The fire broke out far away from the marquee and the animals. No one was hurt.
Vaud cantonal police say they think a nearby construction site was the objective of the arsonists.
Bacteria warning in lakes
Sunny skies and temperatures approaching 30 degrees are expected this weekend, making lakes and rivers popular destinations across. But authorities canton Vaud are warning swimmers about a very real risk: cyanobacteria, which can spread rapidly in warm, still water.
Vengeron beach opens
The Vengeron beach has reopened after being closed since Tuesday due to pollution linked to a ruptured sewage pipe near Geneva Airport.
Nyon family suffers frightening attack
A family in Nyon had a terrifying ordeal when several hooded intruders broke into their house and forced them to open the safe earlier this week.
Lausanne at forefront on antibiotic resistance research
Lausanne is positioning itself at the forefront of fighting antibiotic resistance.
Luxury shoemaker ends Swiss production
Swiss luxury shoemaker Bally is ending shoe production in Switzerland.
Speed camera vandal spared prison
A 52-year-old man from Aargau has avoided prison despite carrying out a major vandalism campaign across Zurich.
