1.   As a train rattles from France into Germany, border guards patrol its corridors, hunting for illegal refugees.

2.   A bomb-sniffing dog patrolled the corridor outside the courtroom as a line of spectators, mostly journalists, passed through metal detectors.

3.   In the dark the ghost hunters quietly began patrolling the corridors.

4.   They spoke of seeing five uniformed police officers, instead of the usual two, patrolling their corridors.

5.   Throughout the day, Secret Service agents patrolled the corridors along with hall monitors, and bomb-sniffing dogs examined the backpacks of slouching students.

6.   Two hospital security officers patrol the corridor.

7.   What was unusual was that the corridors were patrolled by soldiers with semiautomatic rifles.

8.   Bomb-sniffing dogs now regular patrol the corridors.

9.   It is tasked with patrolling the corridor, ensuring freedom of movement and keeping the former enemies apart in the disputed corridor.