At least 11 people were killed and 30 others were injured during sectarian clashes in northwestern Pakistan, local media reported on Saturday. The clashes broke out between two rival groups on Friday evening in Hangu district of North West Frontier Province, private Geo TV channel said. There is no official statement about the reason for the clashes. A jirga, or elders' meeting, has been called for ceasefire in the region. Emergency has also been imposed in hospitals, according to local media.