A number of AMU students later courted arrest when police used mild force to foil their attempt to block movement of trains and vehicles on main roads.
District Magistrate Rajmani Yadav said the exact number of those detained was being ascertained.
AMU Students' Union has already demanded a CBI inquiry into Ahmed's mysterious disappearance.
The students' union President Faizul Hasan has accused the Modi government of protecting ABVP leaders in this connection.
Ahmed, an MSc Biotechnology student, went missing on October 15 after a scuffle allegedly with ABVP affiliated students at his hostel on the JNU campus.
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