Another three people were missing, it said.

Several buildings collapsed during the downpour, trapping residents in floodwaters, local media and witnesses said.

The deaths added to a toll of 15 the government previously gave this week, from flooding that has gripped the west African country since the end of June.

The urban inundations were worsened by uncontrolled construction and clogged gutters, the director of Guinea's National Agency for Emergency and Humanitarian Disaster Management, Lancei Toure, told AFP on Tuesday.