Israeli forces unleashed a series of strikes on the Yemeni capital Sanaa and the western city of Hodeidah on Thursday, killing at least six people and injuring dozens more, the Houthi militant group said in a statement.

"Israeli airstrikes today on Sana'a International Airport, the Red Sea ports, and power stations in Yemen are especially alarming," the UN chief spokesperson said in a press brief

The head of the World Health Organization (WHO) and other UN staff were at Yemen's international airport in Sanaa on Thursday during Israeli air strikes which are reported to have killed at least six people. WHO Director General Tedros Adhanom Ghebreyesus said they were about to board a plane when the attacks began.