Five years ago, Wednesday, a 174-foot-long pedestrian bridge that was under construction collapsed after a section splintered just outside Florida International University’s main campus in Miami-Dade.

Gina and Orlando Duran marked the fourth anniversary of their 18-year-old daughter Alexa’s death on Wednesday with a tribute at Florida International University.

MIAMI-DADE COUNTY, Fla. – Federal investigators determined the probable cause of the deadly Florida International University pedestrian bridge collapse in 2018 was related to engineers’ calculation errors, according to a National Transportation Safety Board report released on Tuesday. The Louis Berger Group peer review failed to detect the load and capacity calculation errors by Tallahassee-based FIGG Bridge Engineers, according to the NTSB report. The calculation errors are related to the designs of the connection to the bridge deck and the main span truss, an assembly of elements that create a rigid structure, according to the report. Investigators believe the parties involved in the construction of the bridge should have closed Southwest EighthStreet to protect public safety. The bridge collapse killed six people: Alexa Duran, 18, Navarro Brown, 37, Brandon Brownfield, 39, Alberto Arias, 53, Oswaldo Gonzalez, 57, and Rolando Fraga, 60.