The accident occurred early on Friday morning, local police say
No one was being allowed into the mosque on Friday without a thorough check.
bdnews24.com Senior Correspondent Liton Haider said from the spot plainclothes detectives had also been posted.
Former Jamaat-e-Islami chief Azam, who led the anti-liberation forced during the Liberation War, died at the BSMMU on Thursday.
He was serving a 90-year jail term for crimes against humanity.
DMP's Motijheel zone Additional Deputy Commissioner Anowar Hossain said they were keeping a watch to foil any attempt to create disorder over Azam's death.