Tesla’s stocks and bonds fell on Wednesday after another tweets of Elon Musk and a day after Mercedes presented competitive threat to US electric car maker, Reuters reports.

Shares fell by 2,8% to $280,74, which is the lowest level since end of May. On Tuesday they lost 4,2% after Mercedes presented its first electric car in Stockholm.

Bonds amounting to $1,8 billion that Tesla issued year ago, fell on Wednesday to the record low. It also became more expensive to insure Tesla’s bonds from default.

As a whole Tesla’s stocks lost quarter of their value since August 7, when Mask announced in Twitter that he secured funding of Tesla’s transfer into private company. He dropped this plan on August 24, however, encountered with lawsuits and investigation of US Commission of Securities and Exchange.

The company continues spending money on increasing production of last Model 3 sedan, and this worries investors. Standard & Poor’s assigned rating “B-“ to Tesla, while Moody’s Investors Service gave “B3” grade. Outlook from both agencies is negative.