Activists are planning a rally seeking answers in the suspension of a suspended Boston police captain who’s the first Muslim man to hold the rank.

Anti-violence community activist Mary Franklin plans to hold the “Not Our Captain Walk of Support” starting at 11:15 a.m. Wednesday at the Islamic Society of Boston Cultural Center at 100 Malcolm X Boulevard before moving up Tremont Street to the Boston Police headquarters at 1 Schroeder Plaza, urging the department to provide more information about the suspension of Capt. Haseeb Hosein and take further steps to address what she sees as racism in the department.

Hosein, a veteran of nearly three decades with the department, was put on paid leave last Monday, pending an internal affairs investigation, the department said at the time. A department spokesman said then that no further information was available because it was an “open and active investigation,” and the department didn’t respond to a request for comment on Sunday.

Hosein and the Boston Police Superior Officers Association, which represents captains, declined to comment. The past president of the Massachusetts Association of Minority Law Enforcement Officers also called for more transparency last week.

Hosein, who normally is in charge of the BPD’s B-3 Mattapan precinct, is regularly one of the city’s top earners, making $398,998 in 2018. Hosein got in trouble in 2007, when then-BPD Commissioner Ed Davis said he intended to fire the then-lieutenant after he garnered 203 complaints from the Internal Affairs Department, the Herald reported at the time. But Hosein remained with the department.