The brother of a woman killed in the Cardiff hit-and-run rampage has paid tribute to her as a heroine who sacrificed her own life to save her children.

Karina Menzies, 32, was walking outside the fire station on Cowbridge Road West with her children when a white van - which injured more than a dozen others in a 30-minute terror spree - careered towards them.

Ms Menzies bravely threw her children out of the way, her brother Craig Menzies said.

He told Radio 5 Live the driver targeted his family.

"He went through the traffic, aimed for them and then just hit them head on," Mr Menzies said.

"She just screamed and threw them out of the way as much as she could. He still clipped them but she took it head-on. She saved their lives."

He told the programme it was "a waste of a life", adding: "She was the world to me. She was my best friend. She was a lively, bubbly person."

Murder squad detectives continue to question a 31-year-old man over the bloodshed with nine victims still being treated in hospital.

Two of the injured adults were in a critical condition and five children were also receiving treatment after the mayhem on Friday afternoon in the Welsh capital.

South Wales Police have been granted a further 36 hours to detain and question the arrested man.