Interest of investment banks

Q 1: There are many banks in Egypt; some are investment and others are not. The non-investment banks are Haram (prohibited) for sure but I need to know whether the interests of investment banks are lawful or not. Note that investment banks always carry out profitable projects such as construction, real estate, and many other similar projects.

A: If these banks invest the money they have in usurious transactions, commercial insurance, or the like, it becomes Haram for a Muslim to invest their money with them. Similarly, their profits or interests are Haram. Otherwise, the investment will be permissible and all profits are lawful. May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.