Two Syrian rockets struck Lebanon on Tuesday, April 23, causing damage and heightening tensions between Lebanese Shiite and Sunni communities over neighboring Syria’s civil war, security officials in Beirut said, according to The Associated Press.

Rockets apparently fired by Syrian rebels have hit mostly Shiite areas in Lebanon several times in the past two weeks. One salvo killed at least two people.

The rocket attack came hours after two leading Lebanese Sunni Muslim clerics called for holy war, or jihad, in Syria. They appealed to fighters to protect Sunnis in villages under attack by Syrian troops and pro-government Shiite gunmen.

Lebanon and Syria share a complex web of political and sectarian ties and rivalries that are easily enflamed. Lebanon, a country plagued by decades of strife, has been on edge since the uprising against President Bashar Assad erupted in March 2011.

The officials in Beirut said one of the rockets Tuesday hit a house under construction on the edge of the northeastern town of Hermel near the Lebanon-Syria border. The other fell in a field, they said, speaking on condition of anonymity because they were not authorized to talk to reporters.