Nablus, Aug 21: Israeli troops entered the West Bank towns of Nablus and Jenin in tanks and armored personnel carriers early today, searching houses in a series of raids, police and Palestinian officials said. Shots rang out in Jenin after some 20 tanks, personnel carriers and other vehicles entered, witnesses said, but there were no immediate reports of casualties in either town. A curfew was imposed in central Nablus after more than 30 vehicles - mostly trucks and a few tanks - entered the town. Troops were carrying out searches for bomb laboratories and wanted Palestinians, an Israeli military source said on condition of anonymity. No arrests were made in the latest raids, though six wanted Palestinians were arrested in the area of Jenin last night, the source said. Israeli Prime Minister Ariel Sharon has approved a series of "pinpoint" military strikes in response to a suicide bombing that killed 20 and injured more than 100 in Jerusalem on Tuesday. Bureau Report