PARIS: Anti-terrorist police on Friday arrested four people, including a 16-year-old girl, in southern France suspected of preparing what the interior minister said was an “imminent” attack. The arrests in Montpellier and the small nearby town of Marseillan “foiled a plot to carry out an imminent attack on French soil,” Bruno Le Roux said in a statement. A police source said the four were arrested after buying acetone, a highly flammable liquid that can be used to make bombs. The other suspects were all men, aged 20, 26 and 33, the source said. “It seems that they intended to go through with it and to make several explosive devices.” Searches turned up small amounts of TATP, the homemade explosive used by Islamic State jihadists in attacks on Paris and Brussels, the source said.