At least 88 killed from ethnic violence in Karachi, Pakistan

(CNN) -- The death toll from ethnic clashes in the Pakistani city of Karachi this week has reached 88, local police said Saturday.

Naeem Shah, a Karachi police official, reported three deaths on Saturday, adding to the previous death toll of 85 since Tuesday.

The clashes have been blamed on a bitter rivalry between two political parties -- the Muttahida Qaumi Movement and the Awami National Party.

The Muttahida Qaumi Movement mostly represents Urdu-speaking people who migrated to Pakistan from India during partition in 1947, while the Awami National Party represents Pashto speakers, more of whom are moving to Karachi from northwest Pakistan in search of jobs.

Violence between supporters of the two parties and other turf wars in Karachi have killed hundreds in recent years.