BEIRUT (AP) — Two visiting U.S. senators condemned a double suicide bombing that ripped through a Shiite stronghold of the Lebanese capital Wednesday, saying they were concerned about the spillover effects of Syria’s civil war.

Two bombers blew up their cars near an Iranian cultural center in Beirut, killing at least four people and wounding more than 100. It was the latest in a string of deadly attacks targeting bastions of the Shiite militant group Hezbollah.