A Katyusha rocket fired from Lebanon landed in the northern Israeli town of Shlomi late Wednesday, the army said, heavily damaging a factory in an industrial zone and drawing an Israeli threat of retaliation. There were no injuries, and no one immediately claimed responsibility. But in a statement, the Israeli army said it held Lebanon responsible for the attack, which it said was the third such rocket strike in the past year. "The Lebanese government is responsible for all incidents which take place in Lebanese territory, including these attacks, which are conducted by terror organizations," the army said.The Lebanese guerrilla group Hezbollah has occasionally shelled Israeli positions, although the border has been relatively quiet since Israel pulled out of southern Lebanon in 2000. Hezbollah officials in Lebanon declined to comment, and there was no immediate reaction from the government in Beirut.