At least 20 people were gunned down in Karachi, and almost half of them were victims of sectarian strife, a media report said on Sunday.
Saturday's bloodshed coincided with the visit of Prime Minister Raja Pervez Ashraf and his key cabinet members to the city, Pakistan's largest, Dawn newspaper reported.
The victims included six students of a seminary who were shot dead at a roadside tea shop in Gulshan-i-Iqbal area. Seven other students were injured in the attack, police said.
Others died in shooting incidents in different parts of Karachi. Heavy contingents of police were deployed but no arrest was made.