The Israeli-Lebanese border is calm but Israel remains on alert a day after the deadliest escalation since the two sides' 2006 war.

The Lebanese National News Agency says Israeli warplanes were flying low over border villages on Thursday.

Israeli Defense Minister Moshe Yaalon says the military is "ready for any development" and warned against further attacks.

Wednesday's flare-up started when the Lebanese militant Hezbollah group fired a salvo of anti-tank missiles at an Israeli military convoy in a disputed border area, killing two soldiers and wounding seven. The attack was in retaliation for a deadly Israeli airstrike on Hezbollah fighters inside neighboring Syria earlier this month.

Israel responded to the missiles with shelling. A Spanish peacekeeper with the U.N. force in southern Lebanon was also killed.