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.

The first suspected attack by Yemen’s Houthis on a commercial vessel this year forced the crew of a Greek-owned cargo ship to abandon their vessel in the Red Sea on Sunday. The attack was followed almost immediately by Israeli strikes on a number of Houthi-held ports in Yemen.

Iran’s Supreme Leader Ayatollah Ali Khamenei attended a religious gathering on Saturday, according to Iranian state media outlet Press TV, the first time he has appeared in public in several weeks.