An Israeli airstrike in south Lebanon on Sunday evening killed four civilians, including a woman and three children, according to local officials. The strike occurred amid escalating clashes between Israeli troops, Hezbollah militants, and their allies along the Lebanon-Israel border. The conflict has intensified as Israel conducts a ground incursion in Gaza against Hamas, a group allied with Hezbollah. Lebanon's state-run National News Agency reported that two civilian cars, carrying members of the same family, were traveling between the towns of Ainata and Aitaroun when they were hit by the airstrike. One of the cars was directly hit and burst into flames, resulting in the deaths of the woman and three girls, ages 10, 12, and 14. Hezbollah responded by firing Grad rockets from southern Lebanon into Israel. At least one civilian was killed in the Israeli strikes, according to the Israeli military. The incident has raised concerns of a dangerous escalation in the conflict. Israel has not apologized for the attack, stating that they attack based on intelligence information and will continue to do so in order to defend themselves. Lebanon has condemned the attack as a "heinous crime" and intends to submit a complaint to the United Nations.