Islamabad, Rabi Al-Akhir 28, 1432, April 02, 2011, SPA -- At least 20 armed tribesmen were killed and a number of others wounded in armed clashes that erupted this morning between the two rival tribal factions on the basis of sectarian strife in Pakistan's Khyber tribal district bordering Afghanistan. According to reports from the Khyber, the clashes took place in Landi Kutalib Province between the banned 'Lashkar-Islam' group and another group, whose members used heavy and light weapons in the fighting. Local sources said the clashes between the two groups generated an atmosphere of fear and panic among the civilian population in the Province, noting that tribal leaders and local authorities are seeking to establish a truce between the two groups. --SPA 14:14 LOCAL TIME 11:14 GMT www.spa.gov.sa/879660