According to Bloomberg News, the partnership between Tesla and Toyota was "marred by clashes between engineers".[132] Toyota engineers rejected designs that Tesla had proposed for an enclosure to protect the RAV4 EV's battery pack; Tesla used a similar design in its Model S sedan, which led to cars catching fire due to punctured battery packs.[132] On June 5, 2017, Toyota announced that it had sold all of its shares in Tesla and halted co-operation, as Toyota had created their own electric car division .