1.   He said that he was having trouble imagining that the buildings came down without an assault with additional explosives.

2.   Police blocked the area off to cars and combed nearby streets for additional explosives.

3.   Police using dogs searched the area for additional explosives.

4.   After the explosion, police closed off the area, and sniffer dogs searched for additional explosives.

5.   Ambulances and rescue workers rushed to the scene, and police sealed off the area and searched for additional explosives.

6.   Ambulances and rescue services were rushing to the scene and police sealed off the area to search for additional explosives.

7.   Ambulances and rescue services rushed to the scene and police sealed off the area to search for additional explosives.

8.   Border police officers in flak jackets, armed with assault rifles, patrolled the area, as security forces and dogs searched for additional explosives.

9.   Explosives experts defused the bomb at the scene and searched the bus for additional explosives.

10.   Explosives experts diffused the bomb at the scene and searched the bus for additional explosives.