Israeli troops killed a Palestinian and wounded at least 11 during clashes with demonstrators in the occupied West Bank and Gaza Strip as Jews marked Yom Kippur, the army and Arab sources said. In Arab East Jerusalem, a firebomb was thorwn at a riot police patrol yards from the house of Industry and Trade Minister Ariel Sharon. No one was hurt, police said. The slain Palestinian, 18, was leading a violent demonstration in a Gaza Strip refugee camp against Israeli occupation, an army spokesman said. Israeli television, quoting military sources, said troops wounded seven Palestinians in the Gaza Strip and four in the West Bank, but Palestinian sources said l6 were hurt.