Thirty-one men working in a massive underground tunnel in Los Angeles were rescued Wednesday night after a portion of the structure collapsed, officials said.

The Los Angeles Fire Department rushed to Wilmington after a tunnel collapsed and trapped 27 people inside.Four other workers went in after the collapse to help the others. The construction workers inside the underground tunnel were rescued roughly an hour after the collapse,

An industrial tunnel in Los Angeles collapsed partially. None of those rescued had major injuries, authorities said.