Karachi residents sift through the debris of their burned-out neighbourhood, the morning after a bomb killed at least 45 people in Pakistan's commercial capital.
A suspected suicide bomber attacked Shi'ite Muslims as they were leaving a mosque on Sunday.
Pakistan has seen fewer suicide attacks on government and military targets over the past year.
But killing on the streets of Karachi points to a new type of threat.
A campaign led by the al Qaeda-linked Lashkar-e-Jhangvi and allied Pakistani anti-Shi'ite groups to rip open sectarian fault lines in the city of 18 million.
Residents of the city say they are under siege by Lashkar-e-Jhangvi death squads who seem to act with impunity.
(SOUNDBITE) (Urdu) LOCAL RESIDENT GHULAM ABBAS SAYING:
"We do not know what is to become of this country. The government is quiet. It is standing around like a spectator. You are seeing what is happening to Muslims. A person can not leave his house without wondering w
