A Border Force officer is among 12 people arrested by police investigating a group suspected of importing drugs and firearms into the UK.
The officer, 36 and from Dover, was detained by French police near Calais with three other British nationals. All four remain in custody.
Eleven firearms, 74lb (34kg) of cocaine and 16lb (7kg) of heroin were seized.
Eight men were later arrested by the Met Police in Kent and London, six of whom have been charged.
The six are accused of conspiracy to import firearms and class A drugs and are due to appear at Barkingside Magistrates' Court, the National Crime Agency (NCA) said.