[cnn-photo-caption image=http://i2.cdn.turner.com/cnn/2009/WORLD/asiapcf/05/27/lahore.blast/art.blast.scene.afp.gi.jpg caption="The scene of an apparent suicide car bomb attack on a police building in Lahore on May 27."]
Three suspects were arrested after an explosives-packed van reduced a police building to rubble Wednesday in eastern Pakistan, killing 24.
The morning attack in Lahore - Pakistan's second-largest city - also wounded more than 250 people, most of them police officers and staffers, authorities said.
Immediately after the blast, police arrested two of the suspects, said City Commissioner Khusro Pervez. Local television showed the men being led away by officers.
Sir Ganga Ram hospital, which was damaged by the explosion, was treating 128 victims.
Authorities expected the death toll to rise as rescue workers picked through twisted metal and other debris from the building, looking for more bodies.
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