BEIRUT — Israeli Defense Minister Yoav Gallant arrived in Washington on Sunday for meetings with U.S. officials amid growing fears that border clashes between Israel and the Lebanese militant group Hezbollah could escalate into all-out war.

       Hezbollah released a video message Saturday night threatening to attack crucial Israeli buildings if a full-scale conflict were to break out in Lebanon. The video appears to display coordinates near a central Israeli airport, two power plants, a nuclear research center, a cargo port and a gas field.