ChainCatcher news, according to market news, The Mining Pod blog program disclosed that the U.S. Customs and Border Protection (CBP) is detaining certain imported Bitmain Antminer mining machines at U.S. entry points. The equipment involved includes Bitmain's Antminer S21 and T21 series, which are Bitmain's latest ASIC mining machine series.Sources say that the FCC and CBP have not targeted other ASIC manufacturers such as MicroBT or Canaan. In addition to revealing that the FCC requested a freeze, U.S. Customs and Border Protection did not provide specific reasons for taking this action to the affected parties, nor did it specify how long the goods would be detained.