Four serving members of the British Army suspected of membership in a neo-Nazi group were arrested Tuesday on suspicion of being involved “in the commission, preparation and instigation of acts of terrorism,” law enforcement officials said.

The police in West Midlands said the four men — a 22-year-old from Birmingham, in the West Midlands; a 32-year-old man from Powys, in Wales; a 24-year-old from Ipswich, in Suffolk; and a 24-year-old from Northampton, in the East Midlands were being held at a police station in the West Midlands and that police had searched several properties in connection with the arrests.

“The arrests were preplanned and intelligence-led,” the West Midlands police said in a statement, adding that there had been no threat to the public’s safety.

The police did not immediately provide details of any plot in the works, how the men had been arrested or what their roles were in the army.