Thieves struck the Kolles Audi motorhome overnight, taking clothing and equipment belonging to drivers Oliver Jarvis and Christian Bakkerud.
Jarvis lost a crash helmet, two race suits, a HANS device, earplugs and two pairs of boots. Team-mate Christian Bakkerud lost a suit, a helmet and his bicycle.
Jarvis has a spare helmet and is borrowing an extra suit from Timo Scheider and a HANS device from Romain Grosjean. His boots from the DTM were in the Audi truck.
"This is the worst morning of my life," he told AUTOSPORT.