During the construction of the metro in Warsaw, the street collapsed, 100 evacuated

Warsaw - A section of street collapsed today in the center of Warsaw, likely due to the construction of the second metro line. About a hundred people had to leave their homes, and according to PAP agency, Jacek Wojciechowicz, deputy mayor of Warsaw, said that they would not return home for the night. The exact cause of the collapse is not yet known.
     During the incident, a water pipe burst, and there was a risk that water would damage two houses standing near the damaged area. Therefore, their residents had to leave within minutes. There are also transportation problems in one of the busiest areas of the Polish capital, tram services have been restricted and buses are on detours. Warsaw already struggles with huge traffic jams even under normal circumstances.
     In the summer, one of the under-construction stations of the new line was flooded. Warsaw currently only has one metro line, which runs between the south and north of the city. The second line will connect both banks of the Vistula River, among other parts of the metropolis. Mayor Hanna Gronkiewicz-Waltz promises that trains on the second line will operate in 2014.
     Problems with large construction projects are not absent in Prague either. The Blanka tunnel complex collapsed twice in 2008 in Stromovka and then two years ago near Prague Castle.