The two policemen were injured by "hard and blunt instruments", while "two protesters with firearm injuries" were also brought to JPMC, the surgeon told Dawn.
Over 1,200 people have died in Pakistan's Sindh province because of a heat wave described as the worst in decades, as major hospitals in Karachi struggled to cope with the unprecedented influx of patients seeking treatment for heatstroke-related illness.
A 60-year-old Indian fisherman who had completed his prison term and was awaiting release has died at a local hospital in Pakistan's biggest city.
Pakistani security forces on Thursday raided the house of the father of the woman suicide bomber from Baloch Liberation Army (BLA) who blew herself up in Karachi University that killed three Chinese teachers and injured another.
The man behind Aligarh Muslim University 200 years on.