BEIRUT (AP) — A suicide bombing in a southern Beirut neighborhood killed a security officer and wounded 20 people, officials said Tuesday, as an al-Qaida-linked group warned that such attacks will continue as long as the militant Hezbollah group is taking part in Syria’s civil war.

The overnight attack — the second such bombing this week — heightened fears that Lebanon was reverting to a cycle of violence after a few months of respite.