Las Vegas shooter’s motive under investigation

The FBI is digging into the history of the 64-year-old former accountant who carried out the worst mass shooting in modern American history.

Detectives are trying to find out why Stephen Paddock opened fire from a hotel room overlooking a concert in Las Vegas, killing at least 59 people and injuring 500 others.

Al Jazeera’s Andy Gallacher reports from Las Vegas.