Saira,
When you are here in Pakistan, you may contact Rotary Club, Karachi Chapter, which organized a good number of relief efforts.
Other than that, the response of various socio-religious organizations was also commendable in terms of providing relief and sustained services to the affectees. For that, I particularly noticed Jamaat-e-Islami, and even the armed forces. Another NGO was Mahwash Jahangir Siddiqui Foundation (MJSF:
http://mjsf.net/portal/), where I know Ali Charanya, who headed the relief services with UN.
A very good source of data is National Disaster Management Authority (NDMA:
http://ndma.gov.pk/), which has the master data of all efforts.
Hope these links would be helpful to you.
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Best regards
Imran Adeel Haider
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Tel: +92-333-310-3789