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 license 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 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 October 27th, according to trade union IF Metall.

The strike has since expanded to include other repair shops that service Tesla among other auto brands, and dock workers have stopped unloading Tesla cars at all Swedish ports.

In addition to IF Metall, nine other unions have announced “sympathy measures,” including the Swedish Union for Service and Communications Employees (Seko) – which represents postal workers – and the Swedish Building Workers’ Union.

Despite these moves, several Swedish media have reported that their impacts have so far been limited, and IF Metall has accused the electric carmaker of systematically using strike breakers to circumvent the labour action.

Tesla has also found other ways to deliver new cars to Sweden, notably by road.

Negotiated sector-by-sector, collective agreements are the basis of the Swedish labour market model, covering almost 90 percent of all employees and guaranteeing standard wages and working conditions.

According to IF Metall, Tesla had told them it would not sign a collective bargaining agreement because they “don’t do that anywhere in the world”.