Swedish postal workers began halting deliveries to Tesla offices and repair shops on Monday, in support of a strike launched by the metal workers’ union IF Metall over the electric carmaker’s refusal to sign a collective wage agreement.

Financial newspaper Dagens Industri later reported that this in effect could block new Teslas from hitting the road as licence plates for new cars issued by the Swedish Transport Agency are only delivered via mail carrier Postnord.

Replying to a user posting about the issue on X, formerly known Twitter, Musk, who had not publicly reacted to the strike previously, said simply, “This is insane.”

Mikael Andersson, head of press at the Swedish Transport Agency, confirmed in an email to AFP that new number plates are delivered through Postnord.

Andersson explained that the agency was bound to use the carrier under a procurement contract for all government agencies negotiated by the Swedish Legal, Financial and Administrative Services Agency.

Some 130 mechanics at 10 Tesla repair shops in seven cities across Sweden first walked off the job on Oct 27, according to trade union IF Metall.