The top stories this Saturday morning...
US security experts say they think North Korea may be about to carry out another nuclear test.
Satellite images taken of the secretive country show activity taking place at its test site.
Meanwhile North Korea's leader has praised its nuclear achievements.
Kim Jong Un is hosting the country's biggest party congress in decades.
Sadiq Khan has been officially named London's new mayor - but had to wait around six hours for confirmation because of discrepancies over figures.
After securing more than 1.3 million votes, the Labour candidate said he was looking forward to creating a London that's "fair for all".
He also referred to negative campaigning tactics by opponents.
Officials in Canada are worried a massive wildfire which has forced 90,000 people to leave their homes could double in size by the end of the day.
A huge convoy is rescuing residents from the city of Fort McMurray in Alberta - where the flames are destroying entire neighbourhoods.
This woman doesn't know what'll be left of her home.
The DUP and Sinn Fein may be returning to power with the exactly the same number of seats they went into the Northern Ireland Assembly election with.
Around three-quarters of the seats have been filled so far.
The DUP's on course to repeat the 38 wins of 2011 - while Sinn Fein looks likely to secure the 29 it achieved five years ago.
DUP leader and First Minister Arlene Foster says voters have backed the party's promises.
US officials investigating the death of Prince says they want to interview a doctor and his son about a prescription drug taken to the singer before he was found dead last month.
Police in California say they want to know if the two men had a longer term medical relationship with Prince.
They say neither is accused of wrong-doing.