Rolling stock manufacturer Stadler has received a CHF190m ($215m) contract from Swiss public transport company Regionalverkehr Bern-Solothurn (RBS) for the supply of 20 new multiple-unit trains.

Detectives say about £215m was laundered during an eight-year period from 2011. Six men and a woman, arrested during the two-day operation on Monday and Tuesday, have been released on bail.