Death toll from Barcelona attack rises to 16

The number of people killed in twin vehicle attacks in Spain last week rose to 16 on Sunday, local authorities in Barcelona said.

"This morning a 51-year-old German woman died after being treated in a critical condition in hospital," said a statement from the region's civil defence.

The attacks on Las Ramblas boulevard in Barcelona and in the seaside resort of Cambrils left around 120 wounded.

The woman who died on Sunday was hurt when a man ploughed a van through crowds of tourists on Spain's most famous street on August 17 -- an attack that was claimed by the Islamic State group.

Hours later, a car sped into Cambrils some 120 kilometres south of Barceclona, hitting people before crashing into a police vehicle.

The five occupants of the Audi A3 jumped out and went on a stabbing spree, killing a woman, before they were shot dead by police.

Seven-year-old Australian boy, Julian Cadman, was killed in the attack in Las Ramblas, and his mother was seriously injured.

The pair was sightseeing when the van ploughed into the crowd.