Airstrikes have been reported in two cities in Yemen.
Witnesses and Houthi rebels said an airport and a military base were targeted in the capital Sanaa, while a power station in the western port city of Hudaydah was also hit, AFP news agency reported.
Houthi TV blamed the strikes on Israel, which did not comment on the reports.
The casualties were unclear from initial reports. In recent days Israel has warned that it was preparing a major attack on the Houthis after the group fired drones and missiles at it.
Houthi rebels, backed by Iran, have been attacking Israel since the first months of the Gaza war, which began in October 2023.
Houthi missile strike more than a dozen people were injured in Israel last week.
Israel has carried out intermittent strikes against the Houthis in retaliation.
Earlier this week, Israel's defense minister said the country was preparing to “hit hard” at the Houthis, warning it would “decapitate” the group's leadership.
The Houthis are a political and religious armed group supported by Iran. The group has controlled large parts of western Yemen, including the capital Sanaa, since ousting the internationally recognized government in 2015.