Five people remained in custody Tuesday after being detained by French authorities over an apparent failed bombing attempt in an apartment building in a chic Paris neighborhood.

Paris police said a neighbor alerted authorities to suspicious activity early Saturday in the building in the 16th arrondissement, or district. A judicial official said an explosive device was found and deactivated and that counterterrorism prosecutors have opened an investigation. He was not authorized to be publicly named discussing an ongoing case.

One of the suspects was under government surveillance for radicalism, Interior Minister Gerard Collomb said Tuesday.


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