An engineer working on the Miami university bridge warned of cracks in the structure, two days before it collapsed killing at least six people.

Denney Pate, lead bridge engineer for contractor FIGG, left a voicemail with the Florida transport department on Tuesday.

He warned of "cracking" but also said there was no concern "from a safety perspective".

Department employees did not hear the message until after the bridge fell.

The Florida International University (FIU) concrete bridge collapsed on to a motorway, crushing at least eight vehicles driving beneath.

The number of victims is thought likely to rise as workers clear the rubble from the 862-tonne structure, which was erected days before as a walkway for university students.

Read more on BBC.