OTTAWA—Global Affairs Canada says it has received preliminary reports of at least four Canadian citizens who “may be affected” by the collapse of a seaside condominium tower in Miami. The department says Canadian consular officials in Miami are in contact with local authorities to gather additional information and they are also in touch with the affected families. It says no other information can be disclosed because of the Privacy Act. Nearly 160 people are unaccounted for and at least four are dead after the 12-storey Champlain Towers South collapsed early Thursday morning in Surfside, just north of Miami. Officials said they still don’t know exactly how many residents or visitors were in the building when it fell, but they were trying to locate 159 people who were considered unaccounted for and may or may not have been there. While officials said no cause for the collapse has been determined, Florida …