Over 80 people were killed and scores more injured in recent sectarian clashes in northwestern Pakistan. Experts say historic rivalries, extremist Islamist groups, and political marginalization are to blame.

The clashes overnight between Sunni and Shiite tribes in Khyber Pakhtunkhwa Province came a day after gunmen ambushed a convoy of vehicles in the area.

So far in November, Pakistan has suffered around 89 terrorist attacks, including five suicide bombings, which left 298 people dead.