Gallery: Chaos in Kano

People watch as smoke rises from the police headquarters after it was hit by a blast in Nigeria's northern city of Kano. Photo: Reuters

A man walks through the ruins of a zonal police headquarters after a bomb attack in Nigeria's northern city of Kano. Photo: Reuters

Nigeria President Goodluck Jonathan.

A policeman stands guard near the site of the police headquarters bombed by a suicide bomber in Kano. Photo: AP

Locally made explosives found in a car are displayed along a road in Nigeria's northern city of Kano. Photo: Reuters

Police and civilians visit the site of the police headquarters bombed by a suicide bomber in Kano, Nigeria. Photo: AP

Soldiers search a car for suspected explosives along a road in Nigeria's northern city of Kano. Photo: Reuters

A group of Nigerian police stand near the site of the police headquarters bombed by a suicide bomber in Kano, Nigeria. Photo: AP

Police stand guard at the site of the police headquarters bombed by a suicide bomber in Kano, Nigeria. Photo: AP

People inspect damage cars at the site of a suicide bombing at the police headquarters in Kano. Photo: AP

Policemen stand behind damaged cars at the site of a suicide bombing at the police headquarters in Kano. Photo: AP

A soldier stands guard prior to Nigerian President Goodluck Jonathan's visit to the site of the suicide bombing at the police headquarters Kano, Nigeria. Photo: AP

President Goodluck Jonathan (C) stands with government officials during his visit to the police headquarters in the northern city of Kano. Photo: Reuters

Policemen inspect a bomb site at the police headquarters in Nigeria's northern city of Kano, after a bomb attack. Photo: Reuters

A view of the destroyed police headquarters in Nigeria's northern city of Kano following a bomb attack. Photo: Reuters

Emir of Kano Ado Bayero (R) welcomes President Goodluck Jonathan during his visit to the northern city of Kano following bomb attacks that took place. Gun and bomb attacks by Islamist insurgents in the northern Nigerian city of Kano last week killed at least 178 people, a hospital doctor said. Photo: Reuters