Unknown assailants threw a hand grenade last night in the Al Tabbana area in the northern Lebanese city of Tripoli no human losses or material damage were reported. The city of Tripoli experiences between now and then a strained security situation amid calls by some political forces for the disarmament of the city. The most prominent of those events was the security problem which occurred last January between a number of people in Tripoli and the motorcade of Lebanese Minister of Youth and Sports Faisal Karami in which four Karami escorts were injured by a bomb hurled at one of the motorcade’s cars. The city of Tripoli has seen in the month of December last year a series of bloody events in which 17 people were killed and/ 100 injured in one week. The events occurred in the wake of an announcement by the Syrian television that 21 Lebanese were killed or wounded, most of from the city, by the Syrian regime forces in an ambush laid in Talkalakh in Homs while they were attempting to cross from Wadi Khaled on the northeastern borders between Lebanon and Syria.