article_snippet: A French policewoman is among the four taken into custody, French national police said.
article_snippet: A French policewoman worked at the Fort de Rosny-sous-Bois, northeast of Paris, a Paris prosecutor's spokesman said.
article_snippet: According to Le Figaro newspaper, the Fort de Rosny-sous-Bois is the location of an important intelligence center.
highlights_snippet: A policewoman is among those in custody .