Israel’s military launched airstrikes early Monday targeting ports and facilities held by Yemen’s Houthi rebels, with the rebels responding with missile fire targeting Israel.

Israel carried out it first strikes against Houthi targets in Yemen since the Israel-Iran ceasefire, attacking ports and a power plant around midnight local time Sunday night into Monday morning.

The Israeli air force struck three Houthi-controlled ports and one power plant in Yemen early Monday local time, the Israel Defense Forces announced. As part of a military operation dubbed “Black Flag,