What is the ruling on broadcasting from the mosque's microphone about deaths, fires, or the sale of a slaughtered buffalo?

Mourning the deceased in the mosque is permissible if it is solely for the purpose of informing, such as the Prophet (peace and blessings be upon him) announcing the death of Najashi and the commanders of Mu'tah in the mosque. However, if it involves the mourning practices of Jahiliyyah (pre-Islamic ignorance), then it is forbidden. Some scholars disliked raising the voice when mourning. As for calling people via loudspeakers to extinguish a fire or rescue an innocent person, there is no harm in it. In contrast, calling people to buy meat in the mosque is not permissible, because mosques were not built for such purposes.