Cabbies in Madrid, Milan, Paris and London are protesting the U.S.-based smartphone app that they say is threatening their livelihood.

Taxi Strikes Across Europe Protest Uber App

Roads are snarled on June 11 in London as taxi drivers stop their black cabs, blocking the street to protest over new technology they say endangers passengers. The strike action by taxi drivers hit many European cities, Wednesday, sparked by fears about the growing upheaval in the travel and transport industry, largely due to digital technologies like Uber. (Sang Tan/AP Photo)