Pakistanis voted in a by-election in Karachi on Sunday, after shooting attacks killed at least 22 people in the country's commercial hub, where ethnic and political violence has raised fears of instability. Pre-election bloodshed on Saturday night killed at least 22 people in Karachi, police said. The targeted killings come as the city headed to the polls to vote in a replacement for lawmaker Raza Haider, a Muttahida Qaumi Movement (MQM) lawmaker, to a seat in the provincial assembly in the teeming city of 16 million.