ABANDONED prams, shoes, phones, backpacks and handbags which were strewn across the site of the Las Vegas massacre are being returned to their owners.

It comes a week on from the deadliest mass shooting in US history when 64-year-old Stephen Paddock opened fire on the crowd from the nearby Mandalay Bay hotel, killing 58 people.

Thousands of people who were attending the Route 91 Harvest festival fled for their lives as Paddock slaughtered dozens before killing himself.

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Police have spent the seven days since the shooting collecting evidence amid the thousands of items, some stained with blood.

“Whatever was dropped when people started running, those items we’re collecting and we’re going to provide back,” Paul Flood, unit chief in the FBI’s victim services division said at a news conference.

The items have been catalogued with detailed descriptions, and some have been cleaned of things including blood.

They are now being returned to people at a Family Assistance Centre at the Las Vegas Convention Centre, starting with a few sections of the concert scene.

“Just in general, the sheer size of the space, the amount of personal items that were left there, it’s just a huge undertaking,” Flood said.

Las Vegas police found 19 guns and several pounds of potentially explosive materials at the home that Paddock bought in early 2015.