1.   Blocked by barriers from the pedestrian mall, ambulances idled on nearby streets as medics rushed the wounded on stretchers through the narrow alleyways.

2.   Blocked by barriers from the pedestrian mall, ambulances idled on nearby streets as medics rushed the wounded on stretchers through narrow alleyways.

3.   But for some health problems, these collagen barriers can block any effective treatment.

4.   While barriers still block women in some professions, executives agreed that women can capitalize on golden opportunities in banking and financial services.

5.   A section around the Waldorf was declared a frozen zone and concrete barriers blocked streets.

6.   A section of the East Side around the Waldorf was declared a frozen zone and concrete barriers blocked streets.

7.   At the federal courthouse in lower Manhattan, concrete barriers block the street and wire strung atop the adjacent jail is intended to prevent helicopter landings.