They also ran a team of bomb-sniffing dogs through the entire building.
"They also brought in a bomb-sniffing dog and took him all over the library."
"Even in the case of the bomb-sniffing dogs, they're only good for about an hour," he said.
The police used bomb-sniffing dogs to search the stadium, but found nothing.
Few police forces, and no airports, had bomb-sniffing dogs at that time.
Police officers with bomb-sniffing dogs would be sent to the platform.
In some cities, bomb-sniffing dogs were used to check facilities.
The police have also been sweeping some buildings in the area with bomb-sniffing dogs.
Using 38 officers and bomb-sniffing dogs, the police searched the 3,300-student school today, but found no new evidence.
In 2005, it became the first Israeli university to employ bomb-sniffing dogs.