1.   The police scanned the crowd from the roof of City Hall.

2.   Viisage Technology, a Massachusetts firm, has developed a system that would allow police to scan a driver after they stop a vehicle.

3.   Mexican police scanned the crowd.

4.   Mayor Rudolph Giuliani said police are scanning videotapes detectives have received from TV stations and private citizens, hoping to identify more suspects in the attacks.

5.   On a grassy bank strewn with bright memorial bouquets, dark-shirted police scanned the crowd.

6.   Shops were closed, and nervous police scanned the balconies, fearful of rocks being thrown.