1988 Hyderabad massacre, also known as "Black Friday" is the massacre of 162 people in Hyderabad, Sindh in Pakistan in 1988. On the evening of 30 September 1988, about a dozen gunmen on motorbikes or cars fired indiscriminately on crowds killing about 162 and injuring 200 persons. No group claimed responsibility. The Muhajir Qaumi Movement said in a statement that their offices and the house of Hyderabad's mayor Aftab Ahmed Sheikh were targeted by the gunmen, while the Awami National Party provincial president, a Sindhi, said the attackers had struck at both Muhajir and Sindhi communities.
On 1 October, ethnic riots erupted in Karachi, when hundreds of Muhajir militants reacted to Hyderabad's events violently, burning stores and cars and attacking police officers. Doctors in Karachi said at least 46 bodies had been brought to hospitals and 50 more people were injured. Witnesses said that in at least two areas the rioting was directed against Sindhis. The authorities sent in troops to enforce a curfew in both Karachi and Hyderabad. Clashes between Muhajirs and Sindhis had been going on since June.