Two more victims have been found in the rubble of a collapsed apartment building near Miami an official said, taking the death toll to 18.

Miami-Dade mayor Daniella Levine Cava announced the information at a news conference, adding that two of the victims were children.

Earlier on Tuesday, officials confirmed they had found four additional victims – the total of six is the highest one-day death toll so far.

Ms Cava said the number of residents unaccounted stands at 147.

No-one has been found alive since hours after the collapse on Thursday June 24.