12, also known as Masjid Makkah, is a mosque in Philadelphia, Pennsylvania.

Originally built over a century ago for a trade school, it was leased as Mosque No.

12 of the Nation of Islam in 1962 (all Nation of Islam sites were initially called Temples; the NOI switched to the term mosque as a move to add to the Nation's legitimacy by adding elements from mainstream Islam).

12 were charged with killing the family of Hamaas Abdul Khaalis[2] at the Hanafi American Mussulman's Rifle and Pistol Club.

Khaalis was a leader of the Hanafis, a Sunni Muslim school of jurisprudence (fiqh), and the killers were upset by letters he had written that attacked Elijah Muhammad.