Construction workers are returning to the stadium that will host the opening match of the World Cup, five days after an accident killed two workers.

Small groups of stonemasons, metal workers and others trickled into the Itaquerao Stadium in Sao Paulo early Monday morning.

Speaking to The Associated Press, they expressed a mixture of trepidation over returning to work and determination to complete the stadium ahead of the World Cup opener on June 12.

Construction company Odebrecht suspended work on the site for three days after a crane collapsed on Wednesday as it was hoisting a 500-ton piece of roofing, killing two workers.

Authorities allowed work to resume, but the Labor Ministry has frozen the site's nine other cranes until Odebrecht shows adequate safety measures are in place.