Update: At least 20 dead and 100 wounded after shooting at country festival in Las Vegas (Details, pics)

A woman in the crowd screamed 'They're all around...You're all going to f***ing die today' just 45 minutes before a gunman opened fire at a Las Vegas music concert killing at least two people and injuring dozens more, DailyMail.com has learned.

The woman, described as Hispanic and in her 50s, made the terrifying outburst before her and a male companion were escorted out of the venue by security.

Less than an hour later automatic gunfire peppered the music festival crowd turning it into a bloodbath and sending terrified concert goers diving for cover.

At least 20 people are dead and more than 100 wounded after a gunman opened fire on a country music festival in Las Vegas on Sunday.

Derek and Karen Bernard, 53 and 51, from Los Angeles, comfort each other after witnessing the massacre on Sunday night.

Miss Hendricks said she left the Route 91 Harvest Festival before the shooting started, but heard it from her room at the Mandalay Bay Hotel. Is is thought the gunman opened fire.

Police say they are now hunting for a woman named Marilou Danley, who they described as Asian, saying she has information that could help their inquiries. 

Brianna Hendricks, who is in Vegas celebrating her 21st birthday, said: 'There was a lady who came running up behind us in the concert and she started to play with people's hair acting crazy and she told us that we're all going to f***ing die.

'She said they're all around us and we were going to die.