A 22-year-old from London was the seventh person to be arrested by the counterterrorism police investigating an incident at R.A.F. Fairford last month.
The U.S. war in Iran unleashed small-scale attacks by local criminals or disenfranchised young men hired anonymously to target Jewish and American sites in Europe and North America, experts say.
A police roadblock near the R.A.F. Fairford air base. Prime Minister Andy Burnham of Britain said on Wednesday that there were “strong indications that Iran played a part” in the previous weekend’s events there.