This article is more than 2 years old. ___Angela Charlton in Paris contributed. The official was not authorized to be publicly named. Terrorist groups which have threatened it in recent years include Al-Qaeda and Isis. It reopened at about 2.25 p.m. (1225 GMT).
Al-Qaeda threatened a police tower.
( z0 threaten :ARG0 ( z1 criminal-organization :name ( z2 name :op "Al-Qaeda" ) ) :ARG1 ( z3 tower :mod ( z4 police ) ) )
(z0 / threaten-01
    :ARG0 (z1 / criminal-organization
              :name (z2 / name
                        :op1 "Al-Qaeda"))
    :ARG1 (z3 / tower
              :mod (z4 / police)))
Al-Qaeda threatened a police tower .
z1 :name z2
z2 :op1 0
z0 :ARG0 z1
z3 :mod z4
z0 :ARG1 z3