11.   Police blocked the subway entrance, fended off television cameras and carted away bags of debris for minute laboratory inspection.

12.   A concrete overhang collapsed Thursday evening in a crowded subway entrance in St. Petersburg, killing at least six people and injuring several, news reports said.

13.   A concrete overhang collapsed Thursday evening over a crowded subway entrance in central St. Petersburg, killing at least five people and injuring several, officials said.

14.   A concrete overhang collapsed Thursday evening over a crowded subway entrance in central St. Petersburg, killing at least six people and injuring several, officials said.

15.   A concrete overhang collapsed Thursday in a crowded subway entrance in St. Petersburg, killing at least two people and injuring several, news reports said.

16.   City officials on Friday ruled out a terrorist attack as the cause of a collapsed concrete overhang in a subway entrance that killed six people in St. Petersburg.

17.   City officials on Friday ruled out a terrorist attack as the cause of a collapsed concrete overhang in a subway entrance that killed seven people in St. Petersburg.

18.   Red and white police tape barred crowds from the blast site, just outside a subway entrance, and traffic around the huge white monument was cut off.

19.   Red and white police tape barred crowds from the blast site, just outside a subway entrance.

20.   Red and white police tape barred crowds from the blast site, just outside a subway entrance, and traffic around the huge monument was cut off.