BARCELONA, Aug 27 (Reuters) - A 51-year-old German woman died on Sunday 10 days after she was injured in a militant van attack in Barcelona, authorities said, bringing the total death toll from this month's twin assaults in Spain to 16.

She was left in a critical condition when a militant drove the rented vehicle into crowds in Barcelona's famous Las Ramblas boulevard on Aug. 17.

That attack has now killed 14 people, and two others died during the driver´s getaway and in a separate car and knife assault in the Catalan coastal resort of Cambrils.

On Saturday, hundreds of thousands of people marched in Barcelona in a show of unity, many chanting 'I am not afraid'. (Reporting by Sam Edwards; Editing by Andrew Heavens)