The Houthis are locked in a civil war with Yemen’s internationally recognised government, which is backed by Saudi Arabia and were ousted by the group from capital, Sanaa, in 2014.
Saudi authorities said last week that 19 people had been killed in Houthi attacks on the kingdom’s airports.
One missile strike on Riyadh’s international airport on 10 October killed 13 people and injured 308 others – the deadliest attack in Saudi Arabia in more than a decade.
Houthis have been retaliating for strikes on territory that they control in western Yemen, including the capital Sanaa.
More than 70 security personnel were killed earlier this week in a Houthi missile strike on a camp in Yemen’s central province of Shabwa.
A spokesman for the Saudi-backed Yemeni armed forces said the Iran-backed group launched three ballistic missiles at al-Alam camp near Ataq city.
The Houthis’ military spokesman said they had targeted “Saudi enemy concentrations”.
According to the Houthi-run health ministry in north-western Yemen, Saudi air and artillery strikes have killed at least 141 people and injured 395 since 3 September.
The government’s health ministry, meanwhile, said last week that at least 1,282 people had been killed in the conflict across Yemen since 6 August.
