The US Consumer Product Safety Commission (CPSC) has issued a stark warning to riders of the Ridstar Q20 and Q20 Pro electric bikes, urging owners to stop using them immediately due to a serious fire risk. But in a troubling twist, the manufacturer has refused to cooperate with a recall.

Without an agreement, the CPSC’s notice isn’t an official recall, but rather a warning to owners of the apparent danger hidden in this specific manufacturer’s e-bike.

According to the CPSC, the issue stems from the bikes’ lithium-ion battery systems and associated wiring, which can ignite and pose a significant fire hazard. The agency says it is aware of at least 11 incidents involving fires linked to the e-bikes. Those incidents include one reported burn injury, five cases of smoke inhalation, and two instances of property damage totaling more than $40,000.