Two Syrian rockets struck Lebanon on Tuesday, causing damage and heightening tensions between Lebanese Shiite and Sunni communities over neighbouring Syria’s civil war, security officials in Beirut said.

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.

Tuesday’s 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.

Pro and anti-Assad groups in Lebanon have engaged in deadly clashes. Many Lebanese Shiites back Mr. Assad, whose regime is dominated by members of the minority Alawite sect, an offshoot of Shiite Islam. Lebanese Sunnis back the rebels, who are mostly from that country’s Sunni majority.

More In: World | International | News