JERUSALEM—Two rockets launched from Lebanon on Wednesday struck Israel, which responded with several rounds of artillery fire amid heightened regional tensions over an alleged Iranian attack on an oil tanker in the Gulf last week. Israel’s Magen David Adom national ambulance service said there were no casualties on the Israeli side of the hilly frontier, where the rockets ignited a brush fire. There was no immediate claim of responsibility for the rocket strike, launched from an area of south Lebanon under the sway of Iranian-backed Hezbollah terrorists. Sirens warning of a rocket attack sounded in several Israeli communities, including the northern town of Kiryat Shmona, near the Lebanese border. In a statement, Israel’s military said three rockets were launched from Lebanon, with one falling short of the Israeli border and the others striking inside Israel. Witnesses in Lebanon also reported that several rockets were fired at Israel. “In response, [Israeli] …