1.   All their escape routes had been blocked.

2.   The route was blocked for some time.

3.   All escape routes were blocked by armed police.

4.   At another point, when a jammed door blocked their route, they had to go up a flight to switch stairwells.

5.   At another point, they had to go up a flight to switch stairwells when a jammed door blocked their route.

6.   Blocking their route are a half dozen bridges NATO bombs dropped into the Danube river, the major transport link between the Balkans and the rest of Europe.

7.   After milling around briefly, thousands of young men surged toward the line of police blocking the route to the Israeli Embassy and mayhem ensued.

8.   But ice floes were blocking their route back.

9.   I overestimate how long it will take me to get somewhere, thinking that some awful accident will block the route I take and cause me to be late.

10.   In addition, plump strays that fail to leap salmon ladders often block the route for wild fish by crowding the water just downstream.