Israel-Lebanon border calm but Israel on alert day after deadliest escalation since 2006 war

Israeli soldiers treat a wounded soldier near the Israel-Lebanon border, Wednesday, Jan. 28, 2015. A missile fired by the Lebanese Hezbollah group struck an Israeli military convoy on Wednesday, killing two soldiers in an apparent retaliation for a deadly airstrike attributed to Israel that killed many Hezbollah fighters in Syria earlier this month. The violence was the deadliest Hezbollah attack on Israel since a 2006 war between the two sides. (AP Photo/Gili Eliyahu, Jinipix) (The Associated Press)

Spanish U.N. peacekeepers in an armored vehicle, patrol the Lebanese Israeli border, in the southern village of Abbasiyeh, Lebanon, Wednesday, Jan. 28, 2015. Missiles fired by the Lebanese Hezbollah group struck an Israeli military convoy on Wednesday, killing two soldiers in an apparent retaliation for a deadly airstrike attributed to Israel that killed many Hezbollah fighters in Syria earlier this month. A Spanish peacekeeper was killed in the border flare-up. He was identified by the Spanish Defense Ministry as Cpl. Francisco Javier Soria Toledo, 36. (AP Photo/Mohammed Zaatari) (The Associated Press)

Spanish U.N. peacekeepers patrol the Lebanese Israeli border in the southern village of Abbasiyeh, Lebanon, Wednesday, Jan. 28, 2015. Missiles fired by the Lebanese Hezbollah group struck an Israeli military convoy on Wednesday, killing two soldiers in an apparent retaliation for a deadly airstrike attributed to Israel that killed six Hezbollah fighters in Syria earlier this month. A Spanish peacekeeper was killed in the border flare-up. He was identified by the Spanish Defense Ministry as Cpl. Francisco Javier Soria Toledo, 36. (AP Photo/Mohammed Zaatari) (The Associated Press)

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.