11.   Fire exits were blocked by patients on stretchers.

12.   In a takeover, emergency exits should be blocked to keep terrorists from opening them to crash the plane.

13.   Organizers say they plan to try to block the exits from the Prague Congress Center to prevent delegates from leaving.

14.   Pakistani government spokesmen have denied that bin Laden entered their territory and maintained that all reasonable exits have been blocked.

15.   Relatives carried him on a ladder as they sneaked past troops blocking exits from the refugee camp where they live.

16.   Suddenly, tanks blocked key exits and soldiers surrounded the area while sharpshooters fired rounds into the crowd from nearby buildings.

17.   Sticky foam might help to capture intruders by blocking exits with large bags filled with the substance through which an intruder would have to pass in order to escape.

18.   The tables are blocking the exits, the marshal says.

19.   Then uniformed guards blocked exits and held the audience captive for several minutes, until the prisoners had been locked up again.

20.   This time, the United States would make sure the exits were blocked and that the Afghans would press forward.