An official inquiry on Monday urged that all Lisbon cable cars remain suspended for urgent safety modifications following a deadly September crash blamed on a faulty cable.

The Sept. 3 crash when the funicular came off the rails and hurtled into a building left 16 dead. The official inquiry's preliminary report said Lisbon's cable cars cannot resume operating until they can guarantee they have braking systems "capable of immobilizing the cabins in the event of a cable break."

According to the investigators' initial findings, the funicular was going at a speed of 60 kilometers (37 miles) an hour before it crashed. The whole incident happened in just 50 seconds, they added.

Eleven of the 16 victims were foreign nationals, with three U.K. citizens, two South Koreans, two Canadians, one Frenchwoman, one Swiss, one American, and one Ukrainian identified among the dead.

The crash also injured some 20 people, including at least 11 foreigners.