Israeli forces unleashed a series of deadly strikes on the Yemeni capital Sanaa and the western city of Hodeidah on Thursday, according to Houthi-run media, killing at least four people and injuring more than a dozen others.

Air strikes have been reported in two cities in Yemen. Witnesses and governing Houthi rebels said the country's main international 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, the AFP news agency reported.

Director-general Tedros Adhanom Ghebreyesus was in Sanaa airport waiting to board a flight when it came under Israeli bombardment.