(Reuters) – A partly-built high-rise tower in San Francisco whose upper floors collapsed in a major fire on Tuesday was in danger of collapsing further, and a nearby apartment building remained evacuated, a fire official said on Wednesday.

A five-alarm blaze that may have been caused by a welding mishap broke out late on Tuesday at the MB360 apartment complex under construction in the Mission Bay district, said San Francisco Fire Department spokeswoman Mindy Talmadge.

The tower that burned in the two-building, partly built complex had previously stood eight or nine stories tall and was reduced to four stories in the fire, Talmadge said.

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