Rebels shot down a Syrian-military-helicopter in northern Syria on Tuesday, killing its crew-members in a-fiery-crash, while the government kept-up its relentless bombing campaign on the opposition-held region, with an airstrike in which seven-civilians died, activists and news-reports said. Turkey's official Anadolu news-agency reported that the pilot and two others aboard were killed, while opposition activists reported that only two crew members were on board.