Israeli airstrikes hit Yemen’s main airport as a civilian Airbus 320 with hundreds of passengers on board was landing and a U.N. delegation was waiting to leave, the U.N.’s top humanitarian official in Yemen said Friday.

Director-General of the World Health Organization, Tedros Adhanom Ghebreyesus, says he was close to the departure lounge when it was hit.

Israel launched airstrikes on multiple targets in Yemen, including the capital of Sana’a, during the early hours of Thursday morning, while the Yemen-based Houthi militant group was conducting its own missile attack on Israel.