evidence: In the early hours of Monday morning, four men with explosives strapped to their bodies walked into the middle of al-Qaa, a predominantly Christian village to the north of Lebanon's Bekaa Valley. [...] Still, the al-Qaa attacks have significantly raised tensions in Lebanon. Previous reports of Lebanese security forces arresting alleged IS sleeper cells in the north had only heightened fears that the militants may soon lash out in Lebanon as they lose territory in Syria and Iraq. Lebanese security officials warned al-Qaa could be the "harbinger of a wave of terrorist operations," according to a statement released after meeting Prime Minister Tamim Salaam on Tuesday.