Portugal observes national day of mourning as Lisbon streetcar death toll rises to 17

Emergency teams work at the site of a derailed electric streetcar in Lisbon, Portugal on Wednesday.

The streetcar's crumpled wreckage was still on the downtown road where it crashed Thursday. Officials declined to speculate on whether a faulty brake or a snapped cable may have caused the accident.

(Image credit: Armando Franca)