Transport police had to use pepper spray on two people in Ticino after an argument about not wearing a mask.
The four travellers form the German speaking area of the country arrived in the Italian speaking canton last night.
They tried to escape the officers who then used the spray to arrest them.
The police say they have also been charged with drug possession as well as assault.
Switzerland slammed for denying pregnant prisoner visit from the father
The European Court of Human Rights has condemned Switzerland for denying a pregnant detainee her right to family life.
Greens continue fight against federal councillor
The Green Party leader Lisa Mazzone is now attaching specific anti-overheating regulations and air-conditioned hospitals to her party's continuing campaign against Environment Minister Albert Rösti.
Birth rate lifts in Geneva - slightly
Births are rising again in Geneva after two years of decline.
New fibre optic cable under the lake
Hidden beneath the surface of Lake Geneva, a major engineering project is underway.
Storms unveil 1970s air crash wreckage
The recent violent storms in central parts of the country have brought back memories of an horrific air crash in 1972 when a piece of debris, which had been lodged in a tree for more than 50 years, hit the ground.
Total fire ban in many cantons
Cantons Geneva, Valais, Fribourg, Zurich, Glarus and Schwyz have all imposed total fire bans as the drought pushes wildfire risk into the "high" or "very high" range across most of the country.
